Tommy is a much harder and deeper game. I owned both, and would probably own both again, but Tommy is just a much better game overall to me. Fish Tales is pretty much a one more time kind of game that is pretty fun for a while but if you had a small collection would get old pretty quick I think. Tommy is a challenging game for a long time, rare to make the wizard mode, and has a lot of the special magic that B/W games have (like being 2 million short of the replay and the game will give you a 2 million Lyman bonus to make it, lol).