Ok, here's the thing: this whole "smaller dot covers up less of the target therefore is more precise" mantra is a fallacy.
Technically, if one is using a red dot correctly, with both eyes open (always), it doesn't matter what size the dot is really... because your non-dominant eye will "fill-in the blanks" for one's brain as far as any parts of the target being obscured by the dot in one's dominant eye view. If you don't believe me, keep your head straight and look hard left and right using only your eyes, whether looking left or right, the bridge of your nose was/is obscuring the view of one of your eyes the whole time, but since your other eye had the full visual info, your brain resolves the image and you don't notice your nose being in the way.
A smaller dot IS absolutely harder to find on the draw and maintain under recoil, because it's smaller, and therefore more difficult to see, water is wet too.
Istoleborrowed this from C-More's site, target is at 50 yards which for most is about as far as most will ever ask of a handgun. For whatever reason, seems people talk about this subject of dot size and buy into one theory or another as some sort of ethos, without plainly considering what they're talking about actually looks like in the real world:
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When I first started asking I noted that the dual illumination RMRs have really high MOA offerings and I thought to myself "Dismiss Outright"....
seeing that though, and considering only speed and practical accuracy......bigger can be better.
I am now totally happy with my 6.25 choice even though, and as this post indicates, I kind of agonized over it.