For me, the standard Trijicon night sights are the only way to go. I do have a few pistols with Meprolights and they work font, I just prefer the daylight sight picture of the Trijicons, their white rings are very crisp and clean. The low light picture is second to none. Even XS uses Trijicon tritium vials.
Some really like Trijicon's new HD sights, I prefer the originals.