I've had more experience with Trijicon's, but my limited experience with Mep's has been positive, as well. I'd be satisfied using either.
Is PT Night Sights even still in business? I've bought a few sets of night sights from them and had a number of problems ... poor machining, poor bluing (salts left over!?!) and I had 2 front post capsules and a rear capsule go dark in less than a year.
Out of all the personally-owned and issued Trijicon's with which I'm familiar (as an owner & armorer), I've known of a couple of sets that were damaged due to heavy impacts (a pistol dropped while running, and which tumbles along pavement, can be hard on night sights, it seems), and a capsule that started to become a bit dimmer than the others after only several years.