Doesn't matter to me, just want to be sure it's worth it before I buy it.
I have OOTP 11 and can verify it's a hell of a lot of fun. Basically, you get to be Mike Rizzo and even Davey if you so choose - you are in charge of all rosters, transactions, trades, free agent negotiations, and if you want you can manage every single game too. I haven't played it in a long time because of a lack of free time, but I love the game.