From a pure dps raid oriented perspective, the troll boost is better than the orc on end game since it scale better.
But, i will go with the orc, i don't intend to heavily focus on pvp, but hardiness with a 15% stun resist is to good to pass.

In BC/WOTLK i was playing draeinai shamans, and it was good too, the spell hit bonus is always nice to have and the racial heal, even if all says it's useless, from a multiboxing perspective, it's always nice to have in a "oh shit" button.