The PPQ is an excellent gun and probably has the best trigger of all right out of the box with no mods.
It's easy to carry inside the pants because it has a more triangular shaped slide.
However, there are not many holsters and aftermarket goodies for it like other guns... like Glocks.
Glocks are awesome too. Can't go wrong with a 23 or a 19. same exact size gun, different calibers.
They are extremely reliable and durable, cheap, and the easiest of all guns to get holsters, mags, and aftermarket goodies.... except for maybe the 1911... maybe
PPQ M2 or Glock 19 gets my vote too with Glock 30s being my third choice.