It depends...
In alliance battles, if you prefer running from shrine to shrine capping and not much combat, go with the Kurzicks; if you prefer gathering into a mob and rampaging around, go with the Luxons.
For areas I like the Jade Sea a lot, but the Echovald Forest has a nice cozy feel to it. Although the Wardens are pretty annoying.
For their cultures I go with the Kurzicks because they prize innovation whereas the Luxons just prize mindless strength...
The Kurzicks, by the way, are not emo; black clothes =/= emo; I wear black all the time and I'm not emo. I have three theories as to why they wear black. The first is to blend in better in the Echovald Forest, the second theory is it may be a religious reason to do with the Five True Gods, the third is that it just looks good and because they can afford lots of black dye
