I have them both on a "dry run" sitting at a training dummy. Again about equally geared in terms of spell power and doing normal heals without popping any cooldowns. On 1-2 targets the Shaman will be slightly higher but mana is depleted greatly. Anything above that and the Resto druid heals are off the charts due to aoe heal nature of it.
Will report back when I give it a try here shortly.