I honestly prefer regular Sonic, but in my early days i did have two sets for him.
Out of the ones you can choose, I'd say 1211, 1221, and 1311
Hammer and Burning spindash are pretty good. Especially Hammer since you can get another hit if they don't get out.
I think i used double spring for recovery and to kill people high up with up air, but regular spring does that well too.
I think Regular is the best honestly.
I got the head icons at ssbwiki lol.