On a bolt rifle, the Number 4 wins, hands down.
Old SMLE is in second place here because of shorter sighting radius.
Both have square front sight blades, much easier to aim, especially in bad light.
For a semi-auto, the Garand or the M-14 is really nice: again, square blade fronts and aperture rears.
The secret of using an aperture (peep) rear sight is very simple: forget that it's even there, just look through the little hole, aim with the front sight and squeeze the trigger smoothly.
What messes people up about aperure sights is the strange idea that you have to have the aperture and the front sight blade and the target, all in focus. Ain't possible: against the laws of optics. However, it IS possible to have your front sight and the target both more-or-less focussed at the same time, especially if the light is good. But aperture sights win, hands down.