I shoot at least once or twice a week with one of my Glock 17's, and two or three times a month with one of my 26's.
I mostly shoot those two, and shoot the ones I carry a couple of times each month as well, when I rotate through them. That way they all get shot regularly.
They are all "box stock" guns, so there is no noticeable difference between them and one over the other isnt an issue. Just pick one and shoot it.
I also shoot a number of other different types from month to month over the year, depending on my mood anymore, just to stay on top of them.