I alternate all the time between frozen and live. Depends whats on hand. I like feeding live better because of the freshness but the frozen are safer.
Some of my snakes i have to trick by using the feeding tongs to make the rat look alive. Im the rat puppet master. And as long as the snakes dont see me it works.
I do have one preoblem ball python though. He will not eat a frozen thawed no matter what. If i put a frozen in his cage he gets all defensive and attacks it. But if i drop in a live he takes it within seconds. He is too smart for his own good. He is the reason im getting into breeding ASFs