Definitely Orc for the obvious reason of Hardiness racial trait.
The 25% chance to resist a stun is just so very strong when the majority of your sudden opponents will be a Rogue. If I remember correctly, you have a base 5% chance to resist stuns, and the racial trait stacks with that, so you'll get a whole 30% chance to resist stuns.
It is a blessing.
That aside, I have a love for the Orcish lore and what they stand for in the Horde during these Classic times.