I'm still a big fan of the original 6MOA Amber Delta that Leupold had once upon a time (no longer). For me, Amber doesn't wash out as hard shade-to-bright. The Delta gives me a precise aiming point (triangle tip) or a useful smear of color for fast shooting. Without my glasses one, the triangle was a smear, but a smear with a morphology that lets me kind of get a sense of the top. Perfect? No, but better than a bloom'ed out green or red dot. The real problem is that reticle was only available on the original Deltapoint and I think pre-GJM fixed DPPs.
A 4 MOA dot is my alternative and it works, but isn't really my favorite.