The c-more is what I like the best for ar pistol set up with only that as my optic. It's a good dot it's big enough to see without being so big it defeats the purpose for me. A lot of it it just personal preference really though. I went through many of them to see which red dot I wanted where. (For on top mount of my scope for prs type rifle, for a lever gun, and for AR pistol). I don't like red dot for ar rifle, I'd rather have an LPVO for ar rifle, but it took some trial and error for me to know that honestly.
For just AR pistol set up that I have which is only for that purpose, the C-more has been ideal for me. Any less view than that and it's not enough site picture for me to get on target quickly, which is my whole purpose of that gun. It also has a very good dot option that I like. Hope that helps, it can be a pain to figure out what will work best for you, which is why I frequented the px to buy and sell a few until I found the right match. I tried a few aimpoint and Eotech as well and they were just bigger than I wanted for that pistol.