LOL Hoping for Sonic to be styled after his SA2 person. . . oh god no that would have been messy, we can all dream for that? Yeah, right. I'm sorry but no that was some serious shame to the original character.
Spin Charge (vB) seems to be faster even faster than his run speed maybe. If you stop tapping B sonic will stop charging. While Spin Dash (<->B) moves you backwards if you hold B, and has a hop about the size of Sonic's SH at the beginning. If you let go of B, it does not stop the dash, it releases it. It also might have more knockback than spin charge. I haven't tested this extensively, but I noticed that today it was easier to combo into Uair off the top of the stage from spin dash over spin charge. Although I use spin charge sometimes instinctively because it feels more correct.
I'm okay with his B moves but what I really want now is a REAL spike/meteor instead of that lame dair he has. They made it useless, laggy, and it doesn't even cancel upwards momentum.