I have a regular PPQ Navy and it is my go-to for IDPA and general shooting. It's very accurate and a dream to shoot. I ran it VERY hard on an advanced pistol/CCW course in Arizona last year and it was every bit as reliable as the five Glocks on the course.
I also have a p226 Xtreme which shoots great, but it is MUCH heavier and I find it much clunkier.
I would strongly recommend the PPQ ahead of the Sig, especially at current prices.