I just finished testing all of the ball attacks and supernova deals the most damage. Super vanishing ball came in 2nd and Super spirit bomb came in 3rd but spirit bomb is more helpful because it freezes the target in place so other players can attack the target with ease.
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Death ball and supernova have good tracking and distance. Some of the other ones lack. I like that there's Z souls for some of the moves that improve the attack power. Should check to that as well.