I'm not really sure from what I've read on these forums F/T are better. However switching from live to F/T can be a pain. He was raised on F/T and has been a great eater. Everytime I move him up to a bigger mouse or larger quantity he never refuses. I believe if you try to refreeze a mouse after being thawed they lose nutrional value but I haven't run into that problem yet and if I do I'll just toss it.