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I'm leaning towards aimpoint for battery life.
That is a huge advantage of the aimpoint. I personally prefer the aimpoint because it's simply a dot, the eotech is a little more cluttered. However like I said they are both quality optics, I've seen guys drive both hard.
Will watch this thread as I am in the market for some kind of optic for my AR. I am leaning Eotech just because I like the magnifier/sight combo.