Since you only had the snakes for 2 weeks right now your priority is to get them to eat and generally speaking feeding what was previously offered for 2 to 3 weeks is best (adult mice not small), once completely settled and eating for you, you can switch if you want to starting with a rat that is the same size than the mice previously offered and than go up in size.
The bottom line is to feed what works and is convinient for YOU, you do not have to feed rats you can feed mice if you want to, as they grow you only have to feed multiple which can be 2 to 4 a week.
One prey is not better or healthier than the other gram per gram it's all the same the only difference is how many are needed to feed an adult BP.
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