to go RDS or not is the million dollar question
For concealed carry, maybe not much of a concern, but for open carry/duty holsters were snow, mud, etc. can obscure the glass...now what? BUIS won't work through occluded glass.
Trijicon HD Yellow front dot on my G21 and 3 M&P 9mms.
Ameriglo I-Dot Pro Yellow front dot on my Shield .45 and S&W SD9VE.