Ive had guns with both Trijicons and Meprolights. These days I mostly use Meprolights when I replace things, since they are what Ive been using for quite awhile now. When Glock was still offering them, I just used the factory Glock night sights. Not sure who makes them for Glock, but they are pretty much indistinguishable from the Mepros Ive added later.
The Trijicons I had experience with were mostly older sights that were fading quick, and being replaced. They are also the main reason (that and price) I went with the Meprolights. At the time, the Trijicons seemed to have a smaller vial, and they lacked the white ring around the vial that the Mepros have for daylight use. The new Trijicons at the time seemed to be dimmer when new, than the Mepros too, but vial size may also have had something to do with that.
The last couple of "current" Trijicons Ive seen, seem to have corrected the vial and white ring problems, so I dont know if one is really better than the other now. Id probably go with the one that had the longest warranty and cheapest price.
For longevity and brightness, your best bet are the all green sights. The other colors arent as bright or as long lived. The needing different colors thing to keep from mixing up front from rear is BS. You actually have to work at getting them wrong, and when you do, its instantly noticeable.
If you have a couple of Glocks, or are planning on acquiring more, a sight tool is worth the $100 bucks or so they get for them. They also allow you to easily adjust the rear sight. Changing the sights is easy, and you can usually pick them up off the web for a decent price, especially when someone has them on sale. If youre replacing older sets, you can recover some of the money by selling them on EBay. I was getting about half of what a new set was going for for the old ones ($35-40), which basically paid for my SIG tool.
