Very interesting question. I think it depends on the role you want your druid to play. For me, personally, I have my armor statted mostly with Stam/Pdef bolstered with Stam/HP and Stam/Wis. My accesories, however are straight Int/Matt. I do that so she can solo quest, do mini games, and mirror world with ease. One could quite easily just have swap gear to satisfy that goal. For healing, well, you could probably go without statting at all an still produce adequate heals, the Pdef is for when you all the sudden become the tank, Int/Matt is so you can at least do some damage.
In a nutshell, you would stat with Int/Matt if you feel you need to do more damage, but no need to go overboard as a mage will always out damage you.