I sorta have what your asking about. I've got a PPQ M2 and the P320 full size.
I would agree that the PPQ has a nicer trigger. It feel a bit longer in travel, but it's smoother and lighter. The 320 may have a short travel but mine feels heavy and gritty in comparison.
I struggle with the medium grip and the trigger on the 320. The grip is a bit too big and the trigger just doesn't win me over. I've got a friend that's buying the 320 off of me and I'll keep the PPQ. There isn't anything inherently wrong with it, just didn't fit me well.
I wouldn't hesitate to carry the PPQ with a quality holster and practice. The trigger is light, but not by any means a hair trigger. I got caught more by the short reset than the lightness of the trigger. Took a few range trips to not bump fire the trigger on accident. Once accustomed to it though, it kinda ruins a lot of other triggers.
Something to keep in mind, Sig is still working on ramping up production of 320 parts to meet civilian and military demand. Small grips are still incredibly hard to find, which may or may not be an issue for you. I was told 8-12 weeks before I could expect to see the small grip modular for the full size frame to show up.