I don't think the "Super makes everyone play the same" argument is very sound, considering the game was designed to give every character the same goal. Get to the end of the level, defeat the boss, with the optional task of collecting emeralds for a "good ending." This isn't Sonic Adventure, where every character gets unique gameplay mechanics, different level layouts, and different goals to complete. Inherently, you're doing the same thing anyway. Every once and a while, you'll get exclusive paths for certain characters, but that's about it. The game isn't designed to make characters a completely different experience to play with.