Right now my preference is trending towards circle only.
The circle at 25 yards is a bit bigger than the 8-ring on a B-8, IIRC. I encircle the ring with my reticle and send it. On a 100 pt aggregate, my scores between dot only and circle only are very similar. I haven't spent enough time shooting bulls beyond 25 to have data. I shoot about 75% hits on 8" plates at 50 with either.
I'm better about looking through the circle reticle than the dot and I tend to do less over confirmation with the circle.
I haven't messed with circle dot.