I don't think one is better than the other as far as nutrition goes. Here is a pic I posted on a forum last year. It is sub adult or sm mouse and a rat pup. This is the typical size mouse I was getting at the pet store at the time. The mouse in the pic weighed 19 grams and the rat pup weighed 31 grams. Your snake is getting one and a half times the food for the same energy used. I cannot comment on whether the ratio remains the same as the rodents increase in size.
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