Hard to go past humans really.
- The rep gain bonus is going to save you time - as a pally, you are probably going to want to get rep with at least a few factions (Sons of Hodir, Wyrmrest & Argent).
- The Expertise bonus is nice (2nd most important combat rating in PvE behind Hit).
- The Every Man For Himself ability, in PvE it can be useful for breaking fears and other disorient/stun type effects without having to use Divine Shield and remove all threat. In PvP it frees up a trinket slot giving you the flexibility to get more resilience, burst damage, whatever you like.

Hope this helps.

Cheers,
S.