Short answer: I have no flippin clue. I haven’t been able to get too high level. HOWEVER… I gathered some links for you. For funsies.
Healing Comparison on the MMO-Champion Forums
Class Healing Comparisons on the Relic Forums
Republic Healer Comparison on Jedi Consulars (Old-ish)
And, of course, for all healers, join the Force Heal forums. I think of them as kinda… Plusheal for SWTOR. Things are starting off slowly, but if you build a website, the community will come.