If you follow the
cloud mount series (starts in Tenebrous) it takes you through Tenebrous, Barren Sky and Bonemire and rewards a nice set of Legendary gear along the way. I haven't done Loping in quite some time but I recall being disappointed with the rewards for the effort given (that could've changed with last year's reitemization, though). Like Calthine said, never hurts to go all AA and do both. :)