I use a FO front and plain black rear on my game guns and range toys.
Carry guns are a different animal. Tritium front always.
Plain black rear or two tritium vials with a very strong preference for no outline because they are much easier to ignore. Clutter is no bueno, but in very low light it's not that cluttered since you can't really see the light bars or the top of your sights and the rear dots are quite helpful.