It's the most skilled athletic sport in the world, and is the most difficult to make it in professionally.
You can't possibly think baseball has the best athletes. Basketball? They are all giants that run like gazelles, jump out the gym, and most have beyond great coordination
And professional how? Make it to "the show" or just professional? I can easily argue both, you can play rookie ball in Missoula, MT or Ogden, UT and be a pro...thousands and thousands and thousands have done that. I think it's harder to make the NBA than have a cup of tea with the MLB.