Pal + Pal combo - Ret/Ret or Tank/Heal

Long time reader, first time poster.

Started playing again and bought fresh account with TBC upgraded. Right now I'm running 2 BE Paladins at level 30, one on my account and one on my brother's account. At the moment I am double Ret - nice combo as per single target dps, but considering I'm on RAF bonus, should I head to AOE tank?

Question: To Tank/Heal (AOE) or Ret/Ret or Ret/Heal - which will be faster exp? Ideas?

PS: Any easier method to control 2 melee dps? I run through the mob, and I get the other to attack, but it's tricky. (Using Plexer on OS X)

Thanks in advance!