Mice, Gerbils, and Rats - Which one stinks the least?

So out of mice, gerbils, and rats - which one has the least amount of order? Rather it's in their fur, or in their feces... which is going to be less stinky in their cage? I realize order really isn't a problem as long as their cage is cleaned on a regular basis. I'm just curious to which is the least stinky.