Started with Warrior 3x Mage Paladin and swapped the Warrior for a Priest and went with the Paladin and the AE threat + salvation really made a difference for me. Its so much easier to AoE and it also fitted my end-game plan to main the Paladin as a healer.

Good reference for my setup. One of the reasons i made the switch.
https://www.twitch.tv/deepgift/videos

But there are counter examples from the horde side.
https://www.twitch.tv/isabellae/videos

If you are alliance both setups are fine. For smooth sailing i think Paladin is easier.