So the classic m is the best in cold weather.
The pro m is not as good in cooler weather but still really good, but is better in warmer weather than the classic m. But overall a better performing ball overall. (Hotter)
The classic plus is a 52/275/300. Which translates to a more even temperament ball, but with that means less performance than the other 2. With the higher core it bounces higher, which translates to worse hops for the infield. It’s also lighter, which makes it knuckle more in the air. With it being lighter and compression being higher followed by a lower compression. It will not do damage to ones body like the classic m or pro m.
With all this being said pick your poison....With the balls being currently used there is not a perfect ball to be played with.