I would start on rats out of convenience. All of my snakes are fed rats straight out of the egg. You can switch at any time. But nutritional wise, both mice and rats are nearly identical.
The 10-15% thing only applies for babies and juvies(or growing animals in general) . Not adults. So keep that in mind. If you feed 15% to an adult 2500 g ball, that is way too much if you feed weekly.
Another method to gauge prey size is to feed prey as large as the widest part of the snake.
Personally, I feed live and eyeball prey size. And as someone who feeds live, I would never feed a single large Norway rat. I would rather feed multiple smalls to keep feeding safe for my snakes.
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