This debate over ft/pk vs. live has been beat to death on probably all reptile, snake forums.
I lost a red tail to a rat bite, supervised. In the time it took to flip the lights off and get the lid unlatched and off was enough for a fatal bite. Make sure you can get to them quick, I made it too hard to get to her in time, and she died for it.
Last f/t I got was from Petco, my guess is it had thawed and refrozen, when my bp hit it and squeezed it popped like a nasty little gut balloon, it was gross to clean up, in the viv. and off my bp.