Also, it may/may not be the case for everyone, but my mice averages 8-10 pinks per litter, my rats average 15.
Also, once you got more than a few rodents in your house, escapees
must be taken into consideration.
Mice are much more likely to escape, and once they escape, they stick around, but won't let you re-catch them without a glue trap.
If a pregnant mouse escapes, you're in trouble big time. (The males usually try to escape, but occasionally a female will try to find a better place to nest.).
If you keep the rats in a room with a closed door, and there isn't a lot of space under the door, the rat really can't go anywhere. Besides, rats are kinda clumsy, and are more likely to let you catch them. Mice, not so much. Once they get out, the tame mice run like wild mice, and they like your house.
I live in a condo, I can't take those kinds of chances.

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