I prefer lighter triggers, so I prefer the standard 5.5 pound trigger of a Glock to the 7.5 pound - 8 pound trigger pull of the P99 QA. That said, I think the P99 is a better thought out gun than the Glock. It takes the basics of the Glock (polymer frame / tenifer treated steel / striker fired) design and pushes the concept to the next level (i.e. ambi mag release, decocker, interchangeable backstraps, etc.).
I would think that, given enough practice, anyone could get used to either gun's trigger pull. Although I have shot a lot of Glocks and probably have a combined round count of around 21K through Gaston's various models, I am not overly familiar with the G19. However, I do recall this article where the NYPD verified a design flaw in the G19 that caused a type of jam they termed as a Phase 3 Malfunction. Follow the link below to read up on it.
http://www.thegunzone.com/glock/phase3.html
The article is not a "Glock bash" diatribe. It simply relates a problem that some (not all) users of the Glock 19 have encountered.
Even if that Phase 3 Malfunction was not out there as an issue, I'd have to say that the P99 is capable of better accuracy than a Glock. The tolerances are simply tighter on the P99. For me, I prefer to make tighter groups when possible.
Everyone is different, but it seems to be a mistake to make trigger pull the deciding issue. When looking at what firearm to get, an individual should look at the total package (performance, reliability, features, availability of parts, ammo, and accessories, budget constraints, etc.) and keep in mind that any quality firearm in skilled hands will do the trick.
Good luck on your selection...