I used to use Penn Championship, extra duties, but hitting with my bud Dennis they go dead 2 cans in 45 mins and they are shot.
So I switched to the ATPs like Lendl posted the pic of, and they are a bit better.
I don't like the Dunlop balls, so I use only the Penn ATP or the Wilson US Open.
Mostly the ATPs.
You either die a hero or live long enough to see yourself become the villain.