I have uploaded all of Sonic's Custom Moves. Hope it helps.
Okay, so HA2 does spike enemies. That at least makes it seem a little more promising. Still, I like HA3 more just cause it's the safest to use off stage. Might even be useful for a recovery if a character like Jigglypuff tries to follow you off stage and put pressure on. You can HA them to use like a stepping stone.
A bit disappointed with SD3 though. The fact you can't jump out of it means you can't follow up nearly as well as you can with the other versions. I think you can at least use it for horizontal recovery though, correct? As in, it doesn't send you straight down.
I'll probably stick with SD2. That ground pound ability it has could come in really handy for setting up KOs.
SC2 though I think needs more testing before I can properly judge it.
Right now, SC3 seems more interesting in my eyes. The fact it can push enemies away from you when they're behind you means it has potential gimping ability. Also, you can mess with someone's spacing by using the attack. For instance, a Marth tipper might whiff.
As for the Springs, UpB3 might have better recovery than UpB1, but I don't like how the move hits enemies horizontally away from you when it makes contact. I was hoping it might knock them upwards for potential follow ups, but at least it gives you a higher recovery if you hit someone. Who knows, it might be useful for smacking people under stage ledges.
For now I may go with:
HA3
SD2
SC3
UpB1 (Possibly UpB3)