Play what suits your style. Who really even cares about topping a fleeting chart? Every healer has it's own role to play. Shaman can dispel better than priests. Paladins have better mitigation than all healers. Monks have great HoTs. Druids have the best maneuverability. It all depends on what you want to do.
Me? I could care less about topping charts, I like to dispel and I tend to have an agressive style of healing. Therefore, I generally play a shaman. They have great dispels, great armor and with ghost wolf have a nice instant movement speed if I need to get away.