I have never fed or bred ASFs and don't intend to, because I don't think too many people would want to buy a snake that only wanted to eat those. I have bred both rats and mice, and I guess I am the oddball here who is going to tell you that mice are actually easier and nicer to keep than rats. I actually got out of the rat breeding thing, because my family was complaining about how bad the rats smelled and how much time I was always spending on feeding and cleaning up after them, as well as the large amount of space their cages were taking up in the garage. I finally realized that I didn't actually need the rats, though, because both the ball pythons and colubrids I breed start feeding better on mice anyway. And most ball pythons can be switched to frozen / thawed (which I prefer feeding) or will be sold off by the time they are big enough that they really need to be switched to food that is bigger than adult mice.

With the way I am keeping my mice currently, there really isn't any bad smell at all. First of all, I only keep one adult male mouse. Males are known to have stinky urine, and I think that having only one big male is why my mice don't smell bad. My one big male mouse lives in the main big cage with all of the females that don't currently have babies. Obviously pregnant females get moved to their own breeder rack cages, where they stay until their babies are all fed off or to weanling size. In the big main cage I always place a dish full of substrate (I use aspen shavings) in the corner of the cage, and the mice will use that dish to urinate in, like a litter box. It's super easy to just replace the "toilet dish" when the substrate inside is getting pretty saturated with urine, and then I don't have to clean the cage any more than every two weeks.

When I used to keep rats, I tried setting up dishes with substrate to be litter boxes, and they wouldn't use them at all. They just peed everywhere, and it got stinky fast, even if I only had one big male. No more live rats for me! Buying rats frozen is so much nicer!