I'm pretty much OK with any map rotation, as long as it gets changed up, and all the maps get played eventually. Like I've said before, It's usually bad teams that make a map bad. Sometimes it's just not enough players. Any larger map with only ten players is awful.
I would vote for regular maps on Saturdays though. Infantry only is available all the time elsewhere, and we have it once during the week anyway. I think the server might get busy earlier in the day than normal with regular maps on Saturday.