The experience in our league is different. In past years we allowed Evils to be used for two games as they were more durable than the Dudley ball that most bought. I'm currently using several of last year's Evil's and one Dudley for some back yard BP. The Evils are consistently going further. They sound a bit softer but I think that's a leather cover vs. a synthetic cover. I'd like to know what the experts believe to be the "best ball" 52-300 btw. I'll find a couple and see what happens. I have a couple Evil 44-375's that are unused I'd even trade.
All the best .52s are composite covered. Stuff like Hycors, X Rocks, composite Tattoos, SYCO Hot Dots, or even Tattoo NX3s. Synthetic .52s seem to break down quickly and don't perform that well. I'd put Evils in the same boat. Those balls have poor longevity and seem to mush up dramatically in a very short time.
In order:
1: Trump X Rock
2: Tattoo NX3
3: Dudley Hycor or ASA ZN composite cover
4: Decker Shark (ASA or USSSA .52s)
5: Tattoo composite cover
6: Hot Dot SYCO (composite)
If I had to pick the ball that lasts the longest, I'd say Tattoo NX3. Those balls don't really have a cover. They're a solid plastic ball, similar to a batting cage ball. They perform very well off the bat, and don't seem to wear out. X Rocks would probably be 2nd for durability. The cover on X Rocks can get dinged up, but the core will remain solid for a long, long time.