I like the RM08G's which have
the green triangle.
I have 3 of them, and carry one
on my EDC Glock 17.4.
The triangle stands out better to me
against most backgrounds, as well as
the green over the amber. I like the
ability to use the top tip of the triangle
as a fine aiming point. 40 yard head
shots are almost effortless with a little
practice.
If it's going on a carry piece, than I
believe you should also have tritium
sights, as well. This will help make up
for the few conditions where the triangle
may wash out, and you need iron sights
to help you get to the red dot at the
presentation.
I really like them.
YMMV
John