Any sugar will do as long as it has no additives. I prefer molasses for a couple reasons; it's already in solution, and there's something about molasses- I have no idea what it is specifically- that plants just seems to adore.

And IR... I'm already sweet enough! The sugar just makes the stink stronger!

I'm seriously not kidding, a couple of my friends who take my excess off my hands have been bitching that they need to carry their stash around in glass jars because it stinks up the whole car even double-baggied!