I have both the TFX Pro's and the Tritium Pro's. I like both, but I wish I'd gone with the TFX Pro's on both guns. They are great, and are well worth the extra money.
I do like the Tritium Pro's though. They seem just as bright as Trijicon's that I've had. I also really like the angle to the front of them that makes them easy to hook into something to) like a table or desk to use to rack the slide. My only real complaint is that the edges are sort of sharp and I've had them kind of catch on my shirt a few times. This is very minor though.
With the TFX Pro's, they are more expensive and a bit bigger, however, they are excellent. Their night time performance is what you'd expect. However, they are also significantly easier to pick up during daylight than traditional night sight sights are. I love the fiber optics in daylight.