I've played both sides a bit, and I must certainly say that while Kurzick appealed to me far more in concept, I'm undoubtedly liking the Luxons more in the implementation. Their world is vibrant and full of life, something I expected more from the forest dwelling artisans than the nomadic barbarians.
I was incredibly surprised to find that the Jade Sea areas had more plant life than the forest. The forest floor is most often covered in black dirt, with a random patch of green or a bush... the Luxon side terrain (that isn't frozen jade) is covered in beautifully lush grasses and flowers. It's so much more refreshing to explore through.
Don't get me wrong. I love black things, especially black clothing, but there's only so long I can stare at a game screen consisting of shades of grey and black. I'll take the shimmering Jade Sea over the petrified forest any day... though the Kurzick architecture is great. I just wish it wasn't so darned gloomy
everywhere you go (and yeah, I've seen some of the less-gloomy EAs deeper in, but they're still rather drab compared to the Luxon side).
Also, while it's to be expected with a war going on, the Kurzicks seem to have a really bad attitude towards the Luxons that's irritating to put up with. They have a lot of snooty name-calling that's rather dull and unimaginative (filthy barbarians, Luxon scum, blah blah blah). The extent of the Luxon's Kurzick-hate that I've seen is some amusing joke telling and some blunt statements of the truth. For example, "What's the difference between a block of petrified wood and a Kurzick skull? The shape! Ha!" or "The Kurzicks think that their art and music will earn them the favor of the gods, but we Luxons know that it is only strength that matters." That last is all too ironic, and thus hilarious, with the way the Hall of Heroes and favor systems work.
Besides, who couldn't fall in love with those sleepy-eyed giant turtles that wall off the towns?
I do like the way the Kurzicks' houses are set-up, as in the families not the buildings. It gives than some interesting history that the Luxon's brief background of the current clan-leaders can't quite compare to, but it's a trade I'm willing to make for the more interesting exploration.