If you wanna pretty much play in cat form i would say go Nelf just because they get a little more dodge, that little extra stealth thing and theyre cat form is sleek ninja like but if u wanna tank def go tauren cause the 5% health def matters in the long run along with warstomp just rocking.Personally, I play cat spec as a tauren but thats just because when i tried to roll an ally every PuG i was ever in was comprised of half retarded 12 year olds. So in the long run it mostly matters the faction, but for PvP i would say going tauren with a resto/feral spec would be best, pwns in arena cause u keep your group HoT'd while u stay in bear form and yeh tauren = 5% extra health ftw also having an extra stun (warstomp) can be really useful in pvp