i feel like live is more convenient. if a frozen rat isn't eaten, you toss it, and you're out a few bucks. if i live rat isn't eaten, you put it back in the tub with the rest of the rats until next week. plus with frozen you have to wait for them to thaw out and all that fun stuff. with live you just grab and go. to each their own though. the only animal i have eating frozen right now is my retic and that's just because when he gets up to rabbits i want him to already be used to frozen.