it is really just up to the owner and snake what is a better choice but i personally feed mine live mice the reason for that is because one, thats how it is supposed to be there are no f/t mice in the wild. and two if you freeze the mouse then thaw it out it kills the thiamin and all important B vitamin. so i would suggest feefing live mice unless you can supplement your snake with the vitamins that are lost in the f/t prosess.