I love the ORC racial blood fury.
It increases spell power for a period of time. I have it macroed on to my lightning bolt so i pop trinkets, blood fury and elemental mastery whenever they are up (I will move the elemental mastery off of there when I get lava burst at 75).
Of course the increased stun resist may help in pvp , but hard to measure.

Never really took a look at the troll racial.