Optics are a matter of taste and what works for you PLUS what works over time for lots of others (durability, dependability, battery life, etc.). Caveat Emptor. I purchased a Hakko red dot for my AR and my Benelli M1014, because it represented a good solution for me and was not hyper expensive. I thought I might replace the Hakko someday with something more upscale. But, I haven't. Hakko makes the ACOGs and that's what the military guys use (as well as Aimpoints). Think about target acquisition time and you quickly want an optic with minimal size that lets you QUICKLY acquire a target. Some of the high priced scopes are too much like looking through a tube for me. They hurt my time to target acquisition, so I keep my Kakko Panarama and happily do my 3 gun competitions with no handicap vis a vis my brothers with pricier scope.
Check it out.
Stay safe,
Tacman