What about when the yellow or red ring gets dirty?
I have Trijicon sights on a couple of 1911s and they have a white ring around the tritium vial. This makes them easier to see in the daylight. However, dirt from shooting has all but eliminated the white part on my front sight. This turns it into a simple black sight in the daytime. Still glows great at night.
I have the TFOs on my M&P. The fiber optic seems to be much better. It's bright during the day and doesn't seem to be affected by the dirt/carbon from shooting. If it does get a little dim, a quick swipe with my finger and the dirt is gone.
So, while I'm sure the Trijicon sights are great, I'm hesitant to spend that money just to find out they're not that great after shooting a few thousand rounds.