I'd say xenon has its pro's and cons.
I like them because of the bluish hue, the brightness emitted, they just look very modern.
I don't like them, however, when there's a Escalade or some sort of SUV, raised a little higher than normal, and its xenons hit your rear view mirror full force. Even with the anti-glare tab flipped up, its still very bright and hard to drive with. I haven't noticed this with oncoming traffic, unless its a taller vehicle also. Another thing is that they don't cut through fog. If your one of those that thought it would be cool to put in blue fog lights, good luck. If they are to go bad, big $$$ to get them fixed.
There's probably more of each, but I'll leave it at that. Will I get xenons? Probably, i'm a sucker for blue
but I'll still say regular halogens are fine. Currently I am running a pair of xenon gas filled headlights that plug right into the H4 connectors.