Reading these posts I'd want to say Gnomish, as a Pally doesnt need Jumper Cables. But pally = no ranged attacks. So You may want to take Goblin for the firepower. The mortar + bombs and whatnot will help you with distance fights/pulling :)
I am a lvl 70 pally and I did choose goblin. However. I rarely use any of the trinkets and stuff in an instence in stuff. However I have been known to use the rocket launcher inbetween heals on a boss.