I feed live. I prefer it over F/T.
I find it more convenient and cheaper because I do have quite a few snakes. I also breed my own rats. The rats do pay for themselves, so my snakes are basically eating for free. If I had to thaw out frozen rats and do the zombie dance for all my snakes, it would take an hour or two to feed. Not pleasing for me at all.
With live, I just place the feeder in the tub, and move onto the next one. If I hear a strike, I check out that tub to see if the snake has a good hold and then leave them be. If the snake has a poor grip, I just stick something in the rat's mouth to prevent bites. But otherwise, not usually an issue anyway.
For feeders that are not eaten, just go back into the colony to be saved for next week or are tossed in with my ferrets. Feeding is a quick process.
With frozen, I'd rather not refreeze rats more than once, so I feel like a lot of my feeders would go to waste. Especially since 80% of my snakes won't take f/t.