Options are limited on my island - its either feed live or kill fresh. Having been a veterinary nurse in the past i can see both sides. In honesty i was someone who would have prefered to feed frozen. But my BP has always eaten live with no problem. It is what she would naturally do. When i drop a mouse in they are none the wiser they happily wonder around looking into all the nooks. They never see it coming.
I think out of preference i will always feed live - no matter what the animal righters feel. Its what is best for my BP not for them.