Personally, I'm liking the Kamehameha, but i also like using Piccolo's eye lasers, simply because they are easy to target with at long distances, and they are useful for slowly but eficiently burning away life.
However, once a player's PL get's up there, the eye laser is so weak it's almost redundant.
The super beam cannon is also neat because the double beams almost seem to home in on the enemy.
That's my opinion,
Cykeo out.