All things being almost equal, I'd go with the ProStaff 4-12.
I have a ProStaff 3-9 Rimfire BDC 150 on a 10/22 and really like it, but for an opportunity to reach out there with my old eyes I prefer the 4-12 BDC.
http://i1216.photobucket.com/albums/.../22rimfire.jpg