I own both the Walther P99 and the G19. The G19 was my first Glock back in 1988.
Actually I have two P99's (9mmx19 and .40) and 10+ Glocks.
I carried a G19 while in LE for nearly 5 years and have put many thousands of rounds down range thru various G19's.
I was the firearms instructor for my agency that headed the transition over to the G19 from another 9mm (S&W).
The G19 is one of their best models for LE, CCW, fun shooting, etc., etc. that Glock has.
Now, that being said, I recently "found" the P99 and after extensive range testing/use, it became my daily carry gun replacing either my G27 or G23.
Yea the P99 costs more as do "pre ban" mags for it but then one gets what one pays for.
BTW, I will be buying a third P99 shortly.