I am planning on coming back to WoW and was would like to know peoples' opinions about Healing as a Druid vs. Shammy. I have both at level 85 and need help picking which to level first. I am talking about endgame healing. I was a beta tester and know both classes up to 90, so feel free to cite spells and abilities aswell as glyphs and specs.

Thanks,
Merk