Now first off I'd like to clear a couple things up, I know you guys will probably want to close this thread becasue it seems too similar to the legendaries discussion from the X and Y forum, but hear me out real quick: first off, that thread is meant to deal with ALL Gen 6 legendaries, which, though they haven't been revealed yet, I'm sure will take a big chunk of the thread discussion away from the main 2. This thread will deal only with discussion of Xerneas and Yveltal. Secondly, there was no POLL in that thread, and I'd really like to get an exact number on which legendary is preferred. If these are are not good enough reasons to keep this thread up and you decide to shut this thread down, that's perfectly fine, and please do not feel I am being disrespectful to the mods in any way, I am just laying out a respectful argument that I hope will persuade you.
Anyways, I personally prefer Yveltal vastly to Xerneas, because I love his coloring and appearance and his stance makes it look like he's saying "Come at me, bro" which makes him look like someone you don't wanna tangle with.
But that's just me, let me know what you think in the polls and in the comments. :)