I feed live, to be honest, because it is easier. I breed my own rats, and my snakes readily take live rats. I don't like the hassle of thawing/warming live rats, it stinks and it's gross. I love rats, I have had pet rats for 5 years, but I would be prefer feeding live over frozen. I don't, however, enjoy watching/hearing the rats die. I really don't watch the snakes eat.
I just hope ppl don't use bowls or cups to put the rat to thaw in. That's gross. Just dead animals in peoples fridge besides pork, chicken etc is gross lol. Just saying.