My Commander has plain, black sights. If it was going to be my daily carry, I'd substitute a fiber-optic front. I've shot with a FO front in all lighting conditions, and find it the best all-around sight. Even shooting in low or no light, I like the fiber, as it glows much brighter than ambient light until light levels are quite low, and when it's dark enough that I can't see the glow, I can't see the target, either. Night sights do make it easier to hit in the dark, but I don't know that I should be shooting in the dark just because I can. If I always had a light with me, for positive ID of threats, I might be more likely to go with night sights.
novak plain blk rear with tritium front. Went to this system in early 90's and all my 1911's, for carry or range are so equipped. Night firing scores are about equal w/ 3 dot system, but slightly faster times. Great in daylight because myself and students i've taught naturally concentrate on front sight. just my experience.