5. Super Scourge
The way his clothes change color coupled with his sclera turning black makes this somewhat unique.
4. Dark Sonic
Holy Hedgehogs, this is kinda creepy! From what I can tell, this not only affects his fur, but his skin as well, which, again, is just unique. Combine that with the plain white eyes, and you've got something very bada**. Seriously, if you were to put this in a horror game and I had no context of who Dark Sonic is, I'd be scared out of my wits!
3. Super Gemerl
Ladies and germs, we've reached the top 3. These Super forms actually change the user's physical appearance significantly. The only bad thing I can say about Super Gemerl is that he's too bulky. But, he is still unique enough to warrant a high placement for me.
2. Perfect Chaos
Oh my God, what am I looking at?! After harnessing the negative energy of the Chaos Emeralds, Chaos turns into this monstrosity! This thing is absolutely terrifying! Even the Dreamcast version of him looks cool (sorry for the repetitiveness)! The only reason he isn't number 1 is because there's one Super form that, in my opinion, is more deserving of it.
HMs
Excalibur Sonic and Darkspine Sonic
I forgot about them while working on this. I like both, but I'd have to give the edge to Darkspine Sonic, since Excalibur Sonic is just Sonic in gold armor.
But now... the Super form I think is the best out of all of them is....
1. Super Trip
Ok, you may be asking why I think Trip deserves the number 1 spot. Well, it's for one simple reason: every super form changes the user in some way; they can go Super, Dark, or even gain a new appearance. In Trip's case, however, she actually changes species, going from a sungazer lizard to a full-on dragon! So, for that, I feel confident in saying that Super Trip is the best out of any Super form.