I would go with the Sig 232, though I've only handled them on many occasions. Better sights, better trigger. In the aluminum frame version, it is lighter than the PPK. In the steel frame, maybe an ounce or two heavier.
The PPK maybe a bit "classier" but the sights are squinchy and the DA trigger is an abomination. The single action is pretty nice though. Both I and my father each had one, so I've shot them quite a bit. Carried mine for maybe 10 years.
I've often contemplated getting a 232, as it fits my hand perfectly and points very well for me. My only reservation about it, and the PPK as well, is the lack of a slide lock. Ever tried to clear a double-feed on a PPK? It is not a pleasant experience. A slide lock makes that a whole lot less miserable. In a gunfight, though, I think you'd be pretty much screwed either way.
My current .380 carry gun is a Beretta 85. Points better for me than the PPK, has better sights, has been more reliable as well, and has a slide lock. It is a bit large and heavy, however. So I'm still contemplating the Sig 232. Or a Ruger LCR 3". No double feed worries there.