Disc golf discs come in a variety of plastics. The cheapest ones are called "baseline" and are meant to have better grip at the cost of durability. The most expenisve ones are called "premium" and sacrifice some grip with the promise that they can withstand more use and abuse on the course without changing their flight. But which premium plastic reigns supreme when it comes to durability? This is a great question that we are going to do our best to answer. Some of this will be based on opinion and bias towards certain plastic over others, but I am going to try my best to explain my reasoning for why each one makes my top 10!
It is important to note that some of the newer premium plastics, such as the Royal line, I am going to leave off this list as I don't have enough time throwing this plastic to form an opinion that I am confident in. Another note is that if a plastic from one company is used at several, just assume they are all listed alongside each other. Examples are Discraft and DGA, Innova and Infinite, Dynamic and Latitude 64, MVP family of companies, etc.
1. Innova Champion

Best Trait: Extremely slow and predictable wear over time.
Potential Drawback: Can feel slick or stiff in cold and wet conditions.
Best For: Players wanting maximum durability in stable and overstable drivers.
My top pick for a premium plastic that is going to last you a long time is Champion from Innova. This stiff, see-through plastic can really take a beating before you notice flight changes. One of the best signs of a premium plastic's longevity is how slow the changes in flight are. This is where, in my opinion, Innova's Champion plastic shines. The discs will eventually beat in and become understable but the change is very slow and predictable which makes it extremely reliable.
2. Discraft Z

Best Trait: Elite durability with reliable flight integrity over years of use.
Potential Drawback: Less grip compared to softer premium blends.
Best For: Players who want a premium plastic that seasons very gradually.
A very close second that arguably could be tied for first is Discraft's Z plastic. The only reason it is in second and not in first is I have more experience with Innova's plastic so therefore I am more confident in ranking it at number one. Discraft Z contains many of the same qualities as Innova's Champion though. I have never had a single throw or tree hit change the flight of a disc in Z plastic and in a lot of ways the plastic gets better with age. Even though it is at "number 2" on the list, you can throw Z plastic with just as much confidence as Champ plastic.
3. MVP Proton

Best Trait: Excellent durability combined with a premium transparent feel.
Potential Drawback: Overmold rims tend to show wear faster than the flight plate.
Best For: Players who love MVP molds but still want top-tier longevity.
Proton is an interesting one because the plastic itself is probably equal to Champ or Z but that is only available in Streamline molds. In MVP and Axiom molds, you have the additional factor of the outer rim due to their overmold manufacturing process. This outer rim plastic will get affected much more than the middle of the disc. With that being said, I haven't had many discs change drastically due to the wear on the outer rim. It will however take damage much quicker than Z or Champ.
4. MVP Neutron

Best Trait: Rare combination of strong durability and comfortable grip.
Potential Drawback: Not quite as resistant to wear as Proton or other stiff translucent plastics.
Best For: Players wanting a premium opaque plastic that still holds stability well.
Neutron is the first opaque plastic to make the list. In my opinion, this plastic holds up almost equally as well as Proton which is typically not the case for opaque plastics. This one performs well due to its stiffness. A lot of times the opaque plastic are noticeably softer which is great for hand feel but does negatively affect the durability as a softer plastic becomes more vulnerable to tree hits changing the flight characteristics. Neutron is softer than Proton but harder than a lot of the other opaque plastics on this list.
5. Discmania C-Line

Best Trait: Long-term durability after the initial seasoning period.
Potential Drawback: Can lose a small amount of overstability very quickly.
Best For: Players who like slightly seasoned flights without excessive wear.
When shopping for C-Line discs, if durability is your top priority, try to shop for the clearest ones you can find. In my experience these tend to be the stiffest ones which, as mentioned above, typically lead them to be more durable. My experience with C-Line discs is very similar to my experience with Opto or Lucid discs which I will cover below but at a less drastic level. What I am talking about is how quickly the first level of beating in happens. For some reason, C-Line seems to quickly, like within a few rounds, change flight to be slightly less overstable. What is great about this plastic though is that from there it seems to follow your typical Champion or Z plastic wear patterns where it takes a long time to progress further. This quick initial wear in period is what holds me back from ranking it higher.
6. Prodigy 750

Best Trait: Very stiff feel with impressive durability and consistency.
Potential Drawback: Recent runs feel softer than older versions.
Best For: Players who prefer firmer-feeling premium plastics, especially in mids.
Prodigy's 750 plastic is the most durable and the stiffest of their blends. It does a great job of blending durability with hand feel. Over the years 750 plastic has changed somewhat and in my opinion has fallen down the list a little bit. In 2015-2017 range I probably would have ranked 750 plastic near the top but recently it has gotten a bit softer in my opinion which has affected the overall durability. Still it is a phenomenal plastic and one of my favorites especially for midranges!
7. Discraft ESP

Best Trait: Excellent blend of grip, comfort, and dependable durability.
Potential Drawback: Beats in faster than translucent premium blends like Z.
Best For: Players wanting workable drivers and mids with premium feel.
ESP plastic from Discraft has come a long way in the past few years. This plastic offers a really good mix of grip and durability which is exactly what you want to see out of an opaque plastic like this. It is a softer plastic in comparison to their Z blend but that makes it a very popular choice for their drivers and for mids where you want a flip up or straighter flight.
8. Innova Star

Best Trait: Reliable grip and gradual, workable seasoning.
Potential Drawback: Run-to-run consistency can vary more than other premium plastics.
Best For: Players looking for all-around performance and trusted feel.
Similar to Champ and Z, Star and ESP are very close in my opinion. I gave ESP the edge here because recently it has been a more consistent plastic from run to run which helps a lot when you are buying a disc that you want in your bag for a while. Star plastic has been the gold standard for opaque plastic where both grip and durability are desired for quite a while. It is still one of if not the most popular plastic choices for drivers as it gives you confidence round after round after round in your most crucial shots. Similar to Champ plastic, Star plastic consistently wears in over time but it does do it at a faster rate than a lot of transparent plastics above.
9. Gateway Diamond

Best Trait: Outstanding durability and grip when you get a good run.
Potential Drawback: Large variation between different runs and stiffness levels.
Best For: Players willing to hand-pick discs for the ideal blend.
Diamond plastic from Gateway honestly could be a lot higher on this list if it were the same every time you bought it. At its best, Gateway's Diamond plastic is one of the best on the market with a great blend of stiffness, grip, and durability. Unfortunately, you do not always get the same Diamond plastic. In my experience, the best Diamond for longevity is going to be the transparent runs of Diamond plastic. You can find a spectrum of Diamond out there from fully clear and stiff to fully opaque and softer which makes it hard to zero in on where to put it on this scale.
10. DD Lucid / Latitude 64 Opto

Best Trait: Fantastic hand feel and grip for a translucent premium plastic.
Potential Drawback: Tends to season quickly during the initial break-in period.
Best For: Players who prefer a comfortable premium feel over maximum stiffness.
Rounding out our top 10 we have Dynamic Discs Lucid Plastic (same as Latitude 64 Opto). It is important to note that this does not mean this is the worst premium plastic as there are several that did not make the top 10 and it also doesn't mean that this is a bad plastic at all! The reason it is 10th on the list is because in my experience it is, on average, the softest of the premium plastics on this list. This makes it an incredible choice for hand feel and grip, especially considering it is a transparent plastic, but it does leave a little to be desired on the durability side. Discs in this plastic in my experience change within the first round of using them, but will stay there for a long time. It is almost like it quickly breaks in and then follows a more typical wear in pattern after that like we see from Champion or Z plastic. Regardless, if you have this expectation of the plastic going in, you will be very happy with your purchase!
Conclusion
You can't go wrong with any plastics on this list. Hopefully you are able to use this information to better guide your disc purchasing in the future and know what to expect from each plastic. With so many out there it can be very overwhelming and confusing. Knowing exactly what each plastic does well and what it sacrifices to accomplish that really helps you zero in on choosing the right mold and plastic for the slot in your bag!