i'm from a boxing background, found the fitness training very good and teaches good discipline, but as said before its all down to personal preference. even in boxing different people have different styles.
i'm unlucky in the fact that i'm not massivley tall and my reach isn't as long as others, so if i was sparring with a taller opponent with a longer reach i have to get in and under there attack. great once your there as you can do a lot of damamge, but getting there can hurt and you have to learn to take a few punches
for me it was the fitness and the learning of discipline and control.