Just because gnomes are great!
If gnomes could be every class i would have no other races
Pick the character for what you like looking at, if you wanna min/max gnome is best (even in pvp). Nothing comes close to beating having another 5-6k mana at the start of the battle.
And before people flame me for saying gnome is better in pvp you have to remember that resi is a really good stat right now. Escape artist is also a really cool ability (war root says hello)...
On the subject "Go with this because the other one is fugly" I must say, seriusly think about it.
I went with goblin for the racials, ended up having a bag dedicated only to noggenfogger and quitly looking with green eyes on the female belfs :P
There is no racial in the game that makes taking a race you think look worse worth it, not even Every man for himself in PvP, you often end up wanting that rasilience and going for some crappy resi/sp trinket anyway.