APBA Basic - hugely popular since 1951, originally designed in 1926. APBA Baseball can be divided easily into a few obvious sub-groups. For instance, I play APBA, and only APBA. There are also an amazing number of sub-set groups.people who essentially specialize in one particular game or in one aspect of that game. You've picked the right forum for such questions.there are a lot of guys here who own and play a huge variety of sports (and other) games.
By this time you may be getting an idea that the subject is too big to take in one mouthful.