I say haste. Personally, I find resto druids to be very underpowered healing wise. Then again, whenever I am healing, I'm playing my resto shammy so anything should feel UP when compared to that.
When I'm playing my resto druid it's very hard to counter any serious burst in my opinion. Although having 1 resto druid on your team isn't bad to counter dots or fill in healing gaps, I feel as though the ability to root, go kitty to rock an efc, prowling or that annoying aoe to try to catch stealthies is very valuable in WSG and imo when done right, those are the abilities that make resto druids huge assets to their teams. However, it can be very frustrating solo queuing on one because most games nobody on Horde will touch the flag or Horde will lack potent and focused healers.
This is the first time I've played druid since WOTLK so it's very different. What I've found is if you're taking damage and don't have a LOS, you're pretty much dead. Where as on my shammy I can easily outheal 2-3 dps sitting on me, on my resto druid it's hard to outheal 1-2 serious DPS.
Just my opinion on them atm. I know some people who have been maining druid do just fine, but I rarely see these people play games and get unlucky and have a poor comp.