Umm, I would honestly go with neither. Beetles are expensive to own and fix. The body panels wrap so far around the car, and parts are hard to get to and expensive to get. The only TDI VW I would recommend would be the Jetta. Preludes, I know a couple people who have had "fun" with these. They were without a doubt the worst Hondas ever built. They will break down, and with as old as that one is, I wouldn't suspect it would last very long.
I would recommend, with a slight bias
, an older Ford Focus. They are strong little cars that don't look too bad and are pretty good on fuel. Another car you can pick up for cheap are Chrysler Sebrings, even though they are the lowest rated car in world history. They last a bit and get relatively adequate MPGs. The only other thing I could recommend (and this pains me like none other) is a Toyota Camry or Corolla. My cousin has a Camry, and she loves it, even though my Mercury Sable and F250 are both a lot better
It is your choice, and whatever you choose, I'm sure it will be the best for you.