I say feed what you are comfortable with. I feed mine live.
I hold the rat by the tail and place it in the tub with my animal, i place the rat on the other side and the rat just sniffs around. You can usually tell if your snake is going to eat. Mine usually looks at the rat and follows the movement. Usually they strike right away and there is no room or time for the rat to ever hurt my snakes and if they are not interested i kill the rat and leave the rat with the snake till night and if not i freeze it and use it next week of throw it away. yup yup