Bead, then rifle sights, then GR but many would say differently..
i dislike how high GR sights are.. i love the speed of the bead, and knowing that i can hit clays way out there with it, tells me it is pleantly accurate for most work... and it is the fastest...
for longer range and slug duty,... rifle sights kick but, and GR too sloppy... and with RS can use it like a bead most of the time if you like...