Originally Posted by Mynt
I'm reasonably certain Sona has the best sustain of any healer.
I haven't crunched the numbers, so it may be Kayle or Nidalee, but the important thing is that Sona healers more HP for less mana than Soraka does. And that's a significant milestone.
There's sustain.. and there's.. sustainable sustain. Alistar has the best spammable sustain in the game, no real contest, it doesn't matter if its the lowest or not, it doesn't cost anything and there is no downside to spamming it on every CD, in fact, its pretty much a good idea because it messes up CSing for the other team but it will push your lane.
I could go on, but, I don't think Sona should be picked for her heal, its too weak to be all that notable except in skirmishes, and it doesn't really outshine a shield especially since it can be completely negated by ignite.