I feed live and have never had a problem. I'm not too concerned about parasites or anything because of where I get my rats.
Feeding f/t could definately be more convenient cuz u don't have to go to the store to pick up a rat every week or 2.
I think I do live just because its a bit more natural. A snake is going to kill a rat and eat it. it just kinda makes sense. animals hunt their food, the fact that I am stocking his hunting grounds doesn't take away all the merit of the hunt (just some of it).