I tried hard to like the full-size PX4s, but never really developed a lot of enthusiasm for them; I took to the full-size 92X right away.
The two respective compacts are a draw for me personally, but I believe the PX4 compact is a better mousetrap for most shooters... even with its disappointingly dated lack of grip texture and factory RDO cuts.
My PX4 subcompacts remain useful to me, but with their discontinuance and apparent round-count limitations they are a moot issue for the general population. There will never be a 92X subcompact, and it is probably just as well.