Here are my views on both live and f/t, good and bad:

F/T:
Good:
-not a lot of money
-easy to store them
-the freezing process kills parasites

Bad:
-less nutritional
-larger mice/rats cost more
-freezing process eliminates most of the nutrients

LIVE:
Good:
-more nutritious for your snake
-can make your snake more healthier
-smaller sizes in rodents do not cost a lot

Bad:
-cause serious injury/death
-bites/scratches at your snake if left alone for too long
-could have internal/external parasites

Personally, I like the f/t over the live. I've always fed f/t to my snakes except for when my Dumeril's was being a picky eater.