In total darkness, glow in the dark sights are just about useless, IMO. If you are in total darkness, you basically need to have your target silhouetted or have very low light conditions.
If you're considering using tritium for home defense, placing those dim LED night lights in hallways will silhouette an intruder giving you somewhat of an advantage, if you're in a totally dark bedroom or have no light source behind you.
When I played with them, we had the Trijicon on the AR's. Performed as expected and for the couple years I used them, the intensity never dimmed, so that I think is a plus. No reason not to have them installed on your rifle, if you feel the need or desire.