Sir,
I can't compare the PX4 to the 92 series, which I use, as I don't own a PX4. There are some factory and after market accessories available for the 92. The newer 92A1 even has a dove tail front sight. Mags are also cheap and plentiful, real factory or factory quality mags too, no need to chance crappy mags based on cost. I have a CZ in SA only which I really like. My large hands like the 92 and my aging eyes like the long sight radius. Take care of it and the 92 is boringly reliable.