Wow, I actually needed this poll; I didn't know which to pick for my electric-type on my B/W team.
Zeburaika is a Physical and Denchura is a Special. They both have their pros, but I think Denchura will do a better job for my party than the Zebra. Why?
Mostly because I have my Physical Pokemon already, and I need more Special Attackers.
The fact that Denchura + CompoundEyes is 100% Thunder is appealing to me, too.
Also, because it's a Bug-Type; I need one to try out the new moves introduced and to take out the remainder of my team's weaknesses.
They're both great Pokemon and speedy attackers, which I like. And although Zeburaika has that awesome design, Denchura just fits the description. I WILL get a Zeburaika later in the game, though.
>> Oh, and it turns out that the poll is 50/50. Sorry Zeburaika, I like you and all, but Denchura gets my vote for usefulness.