Sights are a personal preference thing, but I would always advise a shooter to avoid anything on the rear sight (fiber optics, colored paint, white outlines, etc.) that might draw one's visual focus away from the front blade where it belongs.
I have always had a hard time with black target sights on a black target or going between targets (plates, pins, etc.) the sights disappear into
the background and it is very difficult to sort them out again after each shot. Now that I'm getting older and the eyes are changing, it's worse.
For years the orange front and white outline rear was the only way I could keep up with the pack. I shoot with several people who have no
problem at all with all black sights, which I think are the best choice for accurate shooting if you can see what you're doing. I had to drop out
of shooting matches altogether for a couple of years until I got these fiber optic sights. Now I am upgrading my skill level again and am almost
back where I was a few years ago. Also, I have found (for me) that focusing on the rear instead of the front makes both sights more in focus
and well defined and I can shoot higher scores that way. Plus it helps keep me from looking downrange at the target, and concentrate on the
alignment of front to rear sights. The target is a little out of focus, but not too much. With the fiber optics front and rear, I know where the
sights are every second and there is no more hunting for them after every shot. With all due respect - All the Best- Toolguy