The biggest pro of feeding live is that they are more readily taken than f/t.. though numerous snakes take f/t easily every meal their entire lives.
A second big pro to feeding live, if you breed your own feeders, is availability. It's there and ready to go. If you don't breed your own, then a LACK of availability is a big con.
Other than that, F/T has plenty of pros that make it my #1 choice