Our AR optic experience is with Aimpoints, Burris, S&B and Trijicons. Price point & mission are obviously major considerations. For the $s, I haven't seen a better reflex than Aimpoint's Pro. And, their Micro is a great size on our 10" SBR.
Trijicon's MRO provides a big view, and it's somewhat larger size seems about right for our 16" rifle.
Our mid-60s eyes ain't what they used to be, and some magnification is very helpful at 100+yds, and we like Trijicon's 1-6x24 VCOG, and an out of production 1-8x24 S&B too.
Cheers