RE: PX4's. Yes, shooting them one after the other the S&W is more consistent (time, accuracy) for the first shot but after that I'm good with both & both carry well. Both reliable & durable, too.
The PX4's don't like weak powder chargers in any caliber. The S&W .40 & .45 cycle very weak loads. None like the extra friction of steel cases as they will stick in the magazines.
I decided the only PX4 I could part with is the 9x19...maybe.