The Phenomenauts are way better. Reasons, you need reasons?
Well, there are many reasons, including:
1. They just are!
2. Science Fiction heroes cooler than Super Heroes.
3. Punk'n'roll cooler than Dork Ska (sorry, that was a low blow but there it is)
4. tiebreaker: both The Aquabats and The Phenomenauts would probably disagree with my assertion that The Phenomenauts are cooler. So what that let you know?
However, I will grant that the anti-negativity helmets of the Aquabats are indeed: Super Rad.
None of that should be construed as any true knock on The Aquabats, who are clear pioneers in the field of subgenre rockers costumed and elaborately self-mythologized into Saturday morning/Saturday matinee archetypes.