I like the RDS whether Aimpoint, EO-Tech, Docter Sights with Trijicon scopes and or Leupold. They do work well in low light situations. It is faster to pick up the RDS, you can control the light intensity of the RDS, a Trijicon or XS can't.

One of our guys did install a XS sight on his personal rifle, but it had limited use and he purchased an Aimpoint ML-3 later on.
Good luck.