Quote Originally Posted by Ualaa View Post
I'd recommend the tank if you're choosing one, because you can reliably heal from any character via Repeater Regions and/or Clickbars.
But you cannot as easily position the tank, change the facing of the mob, etc... from another character.

You can actually bounce between the characters, be it the Tank, Healer or one of the DPS.
Nothing stops you from switching, whenever it is advantageous to be on one character or another.
Some fights might be a straight tank and spank, but being on another character allows you to see the whole encounter better...
Another fight you might need positioning, and to drive the tank... so you can move the mob, or whatever.
/seconded

I find that positioning of a boss or adds takes a lot more "timeslices" of control time than the occasional repositioning of a healer. Plus I typically find the tank has better feedback on the mob status than dps/healer depending on addons/threat UI settings.