Each has specific variations of scenes and even some events and sex scenes specific to them, you can also change it later in game so go with what you feel is best for you
Actually the game change more on the dominant/submissive characteristic than the top/bottom. The game is more suited for submissive players. You have far more scenes if you are submissive. For example if you are dominant you can't romance Hayden, the longer scene with Gunnar in the track doesn't involve Torben, after the "A person to rent" quest you don't have the additional scene with Harold and so on. It's not a negative criticism, it's obvious that some scenes are easier to write and that if you are a submissive homosexual man in the game you'll read more scenes than a dominant homosexual woman.