One of the best defense rifles I ever owned was an HK 91. The trigger pull sucked but I got used to it. I never used anything but the diopter sight that it came with. Good hits out to 400 meters. I sold it some time back and have been kicking my ass on that decision ever since.
I put the EOTech on my shorty for low light and close conditions to defend hearth and home. My Colt AR has no add ons, less stuff to fail for planned expedition.