I like my Burris 3x AR 332 sight, though it has a short eye relief.
Top of the line: is the Valdada 1.5-8X power scope.
On my M&P 15 upper, in 5.45X39, I have a Burris Tactical XTR-14 in 1-4X, 30 MM tube, with a Burris Fast Fire 1.75X Red Dot mounted on top of the Burris picatinny scope ring. Turrents are a bit mushy, but I still love it.
I'am hearing some bad stories about the EoTech. They're plenty of fakes out there. I have an EoTech 552, 1x power. It has 17 brightness settings. Two years ago... the wind blew the EoTech mounted AR off the shooting bench while it was in my lightly padded gun case -- 2.5 foot drop. After that, it would only go to 7 brightness settings. EoTech repaired it with no charge, except for my one way shipping. Last weekend I was switching the EoTech to another gun. The scope slipped out of my hands, and did a approx. 1.5 foot drop to my living room carpet. It is now back to the 7 brightness settings instead of the usual 17; though the EoTech is "fast as a rattlesnake and twice as deadly."