I Haven't tried all CC's, but the healing CC working best for me is TCResto Druid. Im almost always topping healing meeters. Doing 20-30k hps depending on situation. 392 ilvl. Hazzdruid is also very good, but TCR is more mana effective for me. Have also tried UPaCCBT for paladin, but I think it's a bit unstable. Some experience it a bit slow in 25 man raids, and some says it's great. But if I had to choose between healing with my pala or druid for my guild raids, I would have chosen TCResto Druid. Haven't tried Shamwow enough yet to give any opinion on that CC. Hope that helped a bit