I have owned 3 decent red dots. EOTech, Aimpoint PRO, and Aimpoint T2.
The EOTech has the nice 65 mil circle around a 1 mil dot. It's the reticle I like best, because the dot covers very little of the target, and the circle is very useful for quickly finding the dot zone and in cases where hold over is necessary.
The PRO had , I thought, way too much metal and knobs surrounding the view window. That blocked a lot of down range landscape. I sold it.
The T2 is nice and small, has a plenty bright and NV capable 2mil dot which permits very careful aiming. That's on my Mk23 now. I like it best overall but wish there were reticle options (with circle).