Like most shotgun stuff, it's a matter of training, experience and personal preference. I like GRs on a working gun, especially if more precise or longer distance slug shots might be required. It's possible to ignore GRs at close range and run the gun every bit as fast as with a bead, but it isn't possible to slow down a little when time permits and be as precise with a bead as with sights at a distance.
jmho, fwiw,
lpl