In my experience feeding live is way easier for the snake. Just throw the rodent in there and wait for the strike.
HOWEVER, IF they don't eat it, then you have a live rodent on your hands and I have had to care for rodents for days or weeks, while my one snake didn't eat. I have multiple snakes now and it is easier for me to just do F/T, so I can buy in bulk.
If I ever become a serious breeder with dozens of snakes, I will probably just build a rodent room and feed live. It is just so much more natural and simple. With the proper sized meal and proper supervision, there is little danger of a snake injury.
F/T is just easier for me at the moment, but I would prefer to feed live if I had my own rodents.