For a pure defensive rifle that would see range use from time to time, I’d personally be using an RDS and grab a pair of binoculars or a spotting scope to check groupings since Koko Head is limited to100 yards. For hard use, I trust aimpoint the most but like the eotech reticle. I’m also a fan of Holosun for a more budgetary rds. I think they’ve made their mark in the market and have proven to be fairly rugged.
That being said, I’m in the process of wanting to build a shtf rifle. I’ll be putting an LVPO on it and am contemplating a top or offset mounted mrds. For that type of build, I’m looking for something that is reliable, great at 1x, clear glass and daylight bright. Money no object, I’d probably be looking at a Kahles K16i, Nightforce ATACR, or Gen III razor. At around $1,000, I’d be looking at a used Razor Gen II E, maybe a a trijicon credo 1-6 sfp, or others in that range. At around $500-600, I’d be looking at the Steiner p4xi, vortex viper pst gen II 1-6, and the Swampfox Arrowhead 1-8 or 1-10.