I wish I knew how to add a poll.  Here goes:
seem to be the same price. OKO or C-More for my .22 Target pistol.  Yes it has a Weaver rail not the 7/8 typical .22 rail.

which ever is cheaper.  

OKO.  its probably cheaper, and is superior.  i have two on seperate AR's and am very happy.  for a pistol they are great because of the light weight (2.3oz).
you don't hear much positive reviews on the CMore...there is a thread in the last week discussing this same topic....

OKO - hands down its not even a close competition.

[:)]

Here is an interesting delima. The C more is more at home on a pistol than a rifle as this is what they were designed for how ever the OKO is a better set up. Right now the all of the other IPSC cats I shoot with are lining up to slap me but oh well truth be told get the OKO.

IPSC_GUY sends

I am also in the hunt for a dot sight for my tgt .22.  The smallest dot offered for the OKO is 4 MOA.  You might want to think about what size dot will work for your application.  I am looking for a 1 or 2 MOA dot as the 4 MOA coveres too much of the tgt for precision shooting.  The only choices seem to be EOTec w/ 1 moa and 65 moa ring / Nikon with variable dot size / Hako makes one with 1, & 2 moa dots but I have yet to locate a source for this one / Aimpoint 2x w/ 2moa and C more 2moa.
You might find this helpful:

http://www.ar15.com/forums/topic.html?b=3&f=18&t=164971&page=5
scroll down the page for 2 comparisons between 1 and 4 moa dots.
http://cmore.com/diode.html
more info on dot size at distance.