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Which one of Piccolo's techniques is more powerful?

The Special Beam Canon

Makankosappo always wins, but let's just focus on namekian eyes and antennae in this thread

Both are the same.

I'd say the eye beams. Goku said he was careless, and only got shook up a little as if shocked by a taser. But we saw what even weak beam weapons could do to a careless Goku.