It means a lot to me that you want to read my comic in spite of the style of sprites I use. Thank you. :)
I use Genesis sprites (and Genesis levels) not only because I've actually played those games (I've never played any of the Sonic Advance games since I don't own a DS or whatever platform), the sprites are larger. If I were to make an Advance-style comic, I'd have to scale the entire thing up by 2.
Advanced sprites, however, are most widely used due to the simplicty and easyness to edit them for fan characters. Beause of this, should you make a Sonic fan character using a style other than Advance or similar, it'll prolli be harder to find people who actually like it...
Genesis kind sucks like that due to the gradient shading