You're comparing the polymer framed striker fired PPQ to the polymer framed hammer fired FN FNX. I have a polymer framed striker fired Gen4 Glock 21, and I also have a polymer framed hammer fired HK45 with a manual safety. These are both great pistols in their own right, both very reliable and accurate, and it's tough to compare one to the other, but if I had to choose one it would be the HK45. I think the HK45 has good sights, a better trigger and a more ergonomic grip than that FN FNX. I know the PPQ has slightly better sights & trigger and a more ergonomic grip than my G-21, but I can still shoot this G-21 very well.
So between the 4 guns I mentioned, I'd choose my HK45. Between the PPQ and the FN FNX, I'd take the PPQ, but these guns are so different that its your choice to make.