This is by far the most informative articles I’ve ever read comparing the VP to the PPQ:
By David Crane david (at) defensereview (dot) com April 28, 2015 Last updated on 4/29/15. Speaking of polymer-frame, striker-fired combat/tactical 9mm (9mm Parabellum/9x19mm NATO) pistols, DefenseReview (DR) was curious to know how the Walther PPQ M1 Classic and Heckler & Koch HK VP9...
defensereview.com
Take away:
“The locking block area of the VP9 is clearly stamped and welded at the seams. The PPQ uses a solid, one piece machined locking block for their system.”
I personally found the PPQ to be a softer shooter than the VP9, and as soft as the M&P 2.0. Maybe the M&P locking block is solid too?