If you're going PvP, probably human is the mechanically superior choice.
Draenei will get their racial heal, which is supposed to be 20% of health rather than the static amount.. so that is a PvP consideration too.

For a PvE focus...
Draenei get 1% hit, and the healing ability.

Worgen get 1% crit, and extra movement.
Although, unless the Pally is going Worgen too, you'll not be able to use it often unless you're ok leaving the pally behind of the party.