My two cents:
I own an Aimpoint, an EOTech, and an ACOG. It truly is based more than anything on what you do with the optic. However, when it came down to it, I was issued an Aimpoint, took it off, and brought my ACOG.
I've got a TA31F, for basic CQB, the BAC and chevron work great. However, that's if you're expecting the possibility that you're going to need to shoot something (i.e. clearing rooms, ect.); however, I've decided that I do want something to augment my ability to return effective fire in a completely unexpected situation, i.e. a dismounted patrol in the mountains, and suddenly someone pops out over an IV line right in front of you.
For that purpose, I'm currently looking at getting a piggybacked Trijicon or Doc-Optic type MRD to mount on the ACOG. At the same time, I have no desire whatsoever to give up my ACOG for my Aimpoint, and even with the MRD mounted, I would quickly transition to the ACOG as primary sight, as soon as I got past the instinct stage, into the thinking stage, because just snapping the ACOG and the 4X mag in one eye (both open) can sometimes be disorienting if you don't expect it, especially at close ranges.
HTH,
~Augee