Well honestly, rats are better for the snake, so either way you'd want to feed rats. And depending on how many snakes you have, buying online isn't worth it. I'm pretty sure you can only buy in bulk online, the smallest orders I've seen is 25 and I'm sure you'd be on to the next size before you ran out of the 25 if you only have one snake. That being said, both are great choices, sand boas require low humidity though and that *may* be hard to maintain in a tub though I'm sure it's doable. Sand boas are less commonly kept than balls though, so if you want something a little different I'd go with the boa.