I'm new to the site, but not new to the subject and have been researching the pros and cons avidly for the last few years before owning one of these amazing creatures. The above comment, from all the info I have obtained, is not correct. To start off, frozen actually can harm your snake with improper thawing techniques. Too hot can burn the snake and not thoroughly thawed can drop the snake's internal temperature. And yes, can cause death in some cases. From an unbiased point of view, both methods have equal risks of potential harm and when DONE PROPERLY, both methods are equally safe, effective ways to feed your pet. Millions of snake owners all over use both methods and never have any issues either way. The link provided above is an instance of irresponsible feeding... leaving the snake alone with live prey over night instead of monitoring the feeding session.
<--- Unwise if you're trying to decrease the potential for harm to your pet.