Carry optic glass size. Which is the biggest.

[Edge40]

Curious as to what carry optic has the largest glass surface or field of view, however you want to word it.  I'm having a hard time trying to find out.  Pictures of the sights seems to be the only way to tell and thats not a very reliable method.  I'm mainly interested in the RMR, Romeo and the delta point.  Seen most of them but not together.  Thanks for the help.

[CHARLES D]

I was able to compare the Delta Point with a Burris Fast Fire 111. The glass on the Delta Point was larger than the Burris but I thought the Burris had a clearer dot. I ended up purchasing the Delta Point for a larger dot.  

Seen a Romeo but not side by side comparison. 

[zombywoof]

I have a FFll and a Delta point. I much prefer the DP.

[Jerome]

I like the larger glass on the Romero1 over the Burris FF III. If I have to fish for the dot, it seems faster with the Romero1. Now getting the dot anywhere on the FF III seems to be more accurate than anywhere on the Romero1 - the FF III is easier to center quickly on the glass I guess is what I'm trying to say.