There are much better options than the PPK. It's a classic piece but there are objectively better pistols available now. If you want one because you want one, that's fine too, but just by weight and size and ergonomics there are better choices.
As far as revolvers go, they are less reliable than auto loaders. I have seen multiple revolvers seize up and be unusable while shooting.
1) My Ruger GP100 had a flap of primer cap pop into the firing pin orifice and lock the cylinder up completely until freed by hammering.
2) Ruger Security Six had the ejector unscrew and bind the cylinder. Required a slip of paper to block the lock and screw the rod back in.
3) Taurus revolver got crud under the ejector, lengthening the cylinder and causing it to seize up.
4) S&W had the crane screw fall out and it wasn't noticed until it was reloaded as the cylinder and crane fell off.
Not that self loading pistols are perfect. The difference being that most auto loader stoppages can be manually cured by the user, when revolvers go down you're probably going to need tools.