I own both and the P30 is the better pistol. Only you and your budget can tell if it is worth the price difference. I don't trust plastic sights or guide rods, but that is me and you might feel differently.
- Steel sights on P30 / Plastic sights on the PPQ
- Steel guide rod on P30 / Plastic guide rod on the PPQ
- P30 has a number of trigger options to suit your needs or taste
- PPQ comes with a light, short reset trigger and that is your only option
- Polymer on the P30 is tougher than the PPQ / The PPQ polymer is softer and mars more easily
- P30 is hammer fired / PPQ is striker fired
- P30 shoots softer with a tad less muzzle flip than the PPQ
- P30 has adjustable side plates the PPQ does not
- P30 magazine release is wide and easily manipulated PPQ magazine release is thin and easy to miss under stress (M1 PPQ)
- P30 will hold its value better and longer than the PPQ
I trust them both but trust the HK more and if I had to pick just one I would pick the P30 over the PPQ. Others might choose differently. That is just my preference and I prefer HK guns in general for a number of reasons.