That's pretty much where the similarities end, other than the light weight / compact size of both. The PV was more of a middle class car whereas the VW was designed to be a conveyance that the common Menschen could afford. I've seen countless reviews likening the PV to a 3/4-scale '46 Ford, and that may be a more accurate comparison where styling and drivetrain layout are concerned.
This particular PV544 is a Sport model, from the penultimate year of production. It has the 1.8L B18D engine with twin SU carbs, same as the 1800S from the same model year. Unless you're some kind of kook Volvo collector, I'd argue that a late model PV is the best one to consider. I had a '66 1800S with this engine and can say that it ran like a sewing machine, made decent power, and gave the driver some nice sounds to listen to in the form of intake honk from the twin carb / open-element air filter setup. The B18 was a big improvement over the earlier (albeit similar) low power 4-cylinders that were nestled under the hood.
This PV looks the business, and has some cool 1980s California "Sunset" plates to boot. The seller says the car sat for 10 years prior to their ownership but has recently been given a smattering of mechanical and cosmetic work. Looks like there are still a few minor jobs left for the next owner, like sealing up some leaks and finishing off the interior. As a cool vintage driver that will be dependable and provide plenty of ice-thawing heat in the winter, I can't think of a better candidate.