Well if we're gonna start comparing all the PP Series, I happen to be extremely fond of them.
As a side note: The Umarex PPK/S .22 comes with a threaded barrel. Get a $20 thread adapter and you can screw your favorite .22 suppressor right on.
I also own on of the S&W made PPK/S-1s in the scarce .32acp caliber. I sent it to Walther Arms in Arkansas for the recall and they had it back in just 8 days. Great gun! Very accurate and has never given me any problems at all.



Top row: 380s
Middle row: .32acp
Bottom row: .22LR