Voted EU.
Having played on both European servers and North American servers;
I like the NA skill set better. EU, for the most part, is like mining for gems. You come across a lot of pretty awful combatants, but then you run into the occasional *very* skilled fighter. The skill difference is really wide. Either you're cannon fodder, or a flippin' hero. NA is more consistent, and has a broader average. I find that most combatants are capable, but not many reach the level of skill that the power players in EU do.
However, as much as I like the fighting in NA, I definitely prefer the EU community. It's not so strict with their servers, meaning that people can actually have fun if they want. Administrators only come into play when it gets out of hand, the way it should be. EU doesn't get kick crazy admins jumping on and booting waves of people when the server isn't even half full (because that's CLEARLY the way to seed a server; by clearing it out).
Despite the poll spam on the EU servers, I'm alright with that, because the community is friendlier and generally more accepting, as are the admins. Skill set might be more spread out between great fighters and the not-so-great guys. But they're friendly, making it definitely a better environment to play in.