I don't know the horde quests well enough to be able to chain effectivly. My XP per hour will definatly be better just by grinding. I have a few 60s and high 50s on my old server so I know how and where to grind post 40.

I only plan on doing the quests for items that I want. I'll make a run thru SM and pick up the quest sword, ill make a run thru RFD and get a vanqisher sword. I am not too worried about items, I can PvE fine with BoE blues and greens.