I have decided to purchase a Glock 36 and am wondering about sights. I have never used either the glock nite sites or the XS big dots. I've seen the XS in pictures and they seem like they would be very fast to acquire a sight picture but probably not as good for precision shooting. I can't seem to find a picture of the Glock factory night sights. Over all for a defensive "fighting pistol" which do you recommend/prefer?