This is ridiculous and awesome, so maybe it's awesomely ridiculous

'Law-Enforcement Crushes' Quarterfinals Begin: Castle's Castle vs. Hawaii Five-0's McGarrett! - TVLine

It's a poll, but what I really love about this is how Nathan Fillion is Canadian and Alex O'Loughlin's from Australia. It's the Battle of the Commonwealth Cuties! ::Cue theme music::

Looks-wise, I'll be completely shallow and say O'Loughlin wins (I mean seriously, he looks genetically-engineered). But since the 'contest' is about the characters, I'm totally going for Castle. And only slightly because he's played by a Canadian. :D