You know, I think you might be on to something. I think that Sollux is the most powerful (ie: hurling a fucking planetoid into the infinite abyss with relative accuracy) while Azdaja has more dexterity and skill. Kuprum's probably just got raw power going for him though but, knowing him, he would rely on the art of dirty tactics, like siccing a psionic void on them.

Do remember that Sollux’s Ancestor was used by Condy to power her own personal ship, so that speaks to Sollux’s and Mituna’s raw energy potential- That being said, do remember whenever Sollux has been hurling meteors around without dying, he’s always had Aradia’s help.