I was hedging between the Glock 19 and the P99. I got my P99 QA last week. The trigger pull is not bad at all.
Here's why I went with the P99:
1) Decocker
2) Visual indicator of cock/chamber status
3) Ergo and style
4) Spiral rifling (Glocks have hex, not so accurate I heard)
5) you don't need to pull the trigger to fieldstrip
Pros of the Glock:
1) a little bit cheaper price, still equal/better quality
2) after-market products a bit cheaper and more available
With the Glock, you have to be absolutely careful when you fieldstrip it as you need to pull the trigger to fieldstrip it. What sold me on the P99 was the rangemaster at my range showing me the hole in the wall of the lobby where a LEO discharged while fieldstripping his Glock.
Features that the P99 has that the glock doesn't, which I like:
I was also looking for a carry, and the cocked/chamber indicators were nice. I feel comfortable carrying a pistol that I can tell if it is loaded/cocked. I also like the decocker- I prefer not to carry a pistol cocked, even DA, but with the P99, a small, quick pull on the slide will cock it in a blink.
One last thing- I didnt like the mag release on the P99 at first, as I was used to using my thumb. Once you get used to using your index finger to drop the clip, it's pretty slick. The mag release is a 'sticking point' for a lot of people, it seems (love it or hate it!)