The PPQ supposedly has an awesome trigger, don't know anything about the VP9.
I own both a Walther PPQ and HK VP9. Both triggers are very good. The PPQ has the better trigger between the PPQ and VP9. I posted the following earlier in the thread
(I will make some updates in bold and italics, as some of the information from the previous post is out of date.):
I will work my way from top to bottom comparing the PPQ and VP9, minding that I have not shot the VP9 yet
(I have put 400 rounds through VP9).
Sights: Both pistols have factory three dot sights. The PPQ has three white dots and the VP9 has luminescent sights that glow in the dark after being in the light. I slightly prefer the VP9 sights, not because of the glow in the dark, because my eyes seem to pick up the slightly larger dots a bit better.
Between stock sights, I still prefer the VP9 sights. My eyes still pick them up better. However, both have Trijicon HD Night Sights available and if it was not for the price, I would have them on both.
Slides: The serrations on the PPQ appear to be a hair deeper than those on the VP9 and tend to grab your hand better when manipulating the slide. However, HK added some charging supports at the rear of the slide and they are pretty awesome. The charging supports work in their intended function of easing pulling the slide to the rear.
No updates needed. The charging supports on the VP9 are awesome.
Slide Release: Both have slide releases on both sides of the pistol. The PPQ slide releases are identical in appearance, while the VP9 slide releases are not. Functionally, both pistols are about the same.
No update needed.
Takedown: Essentially the same. The PPQ requires the user to pull the trigger, while the VP9 does not. However, I find the takedown to be ever so slightly easier on the PPQ. Probably has more to due with experience.
Both are stupid easy to takedown. Equally easy.
Trigger: Both triggers are very good. Heads and shoulders above the factory trigger on S&W's M&P and Springfield's XDM. The PPQ has a bit longer take up prior to firing a shot. The PPQ has a lighter trigger pull at the wall. The VP9 has an ever so small amount of creep at the wall before breaking and is slightly heavier than the PPQ. The PPQ also has a shorter reset. The VP9 does have a very nice reset though, just a bit longer. The PPQ barely overtravels on the reset, while the VP9 overtravels slightly farther. Overall, the PPQ is better, but not dramatically so.
The lighter trigger on the PPQ tends to make for better groups. A combination of the short take up on the VP9 and short reset on the PPQ would be perfect. However, I cannot complain about either. Both are very good, with the PPQ being better. If I did have a complaint about either, then it would be the PPQ has spoiled most all other pistols because of how good the trigger is out of the box.
Magazine Release: Both are paddle style, which I prefer. I have short thumbs and have to adjust my grip with most all button style releases if they are on the left side. With a paddle release, I am able to use my trigger finger to drop the magazine and not have to adjust my grip at all. The PPQ's magazine release is the better of the two because it is longer and thus, slightly easier to use. However, I like both and wish more manufacturer would utilize paddles because of their superior functionality.
No update needed, except paddle release magazines should ensure better magazine retention while holstered.
Magazines: The VP9 uses the same magazines as the HK P30. From a quick look, it appears there are only 15 round magazines available for the P30/VP9. The PPQ has both 15 and 17 rounders available, along with Magnum Research 15 rounders that are the same as the P99 magazines, which are compatible with the PPQ and also cheaper than Walther magazines. Based on OEM magazines, Walthers are slightly cheaper; both the 15 and 17 rounders cost less than the VP9s.
No update.
Grip: I am using the small backstrap on the PPQ and small side panels and backstrap on the VP9. Other than the PPQ being slightly lighter, I am not sure I could tell the two pistols apart in hand. Both fit the hand extremely well. The texturing on the VP9 is pretty much the same as that on the PPQ, but just slightly more aggressive.
The grip ergonomics on both pistols are fantastic.
Overall: Without having fired the VP9, it is difficult to say. Both feel great in the hand. Both have very good triggers. The PPQ has been incredibly reliable. I would expect the VP9 to also be incredibly reliable based on HK's reputation.
Having fired the VP9, both pistols are very good. The trigger on the PPQ is better. However, the trigger is not dramatically better. I really like the charging supports on the VP9. I do not think one can go wrong with either. Both are fantastic pistols.
The last part is where I'm at about now. I'd like to be able to enjoy practicing with the gun and have acceptable performance with it.
I have shot a friend's 4" 9mm XDS quite a few times and my accuracy suffers comparison to the PPQ or VP9. The small size makes it difficult to get a very secure grip on the pistol. The lesser quality trigger does not help matters. My friend's XDS has even had some trigger work done. Even with the trigger work, the PPQ and VP9 triggers still blow the XDS trigger out of the water.