[Igovert500]

Well, I can't say which is better for your car, as I don't have a Jetta, Personally, I would go with a turbo, but here's some things to consider when choosing.

Turbos essentially use the exhaust gases to spool the compressors. Advantages of this are: it doesn't drain power. Disadvantages: it's not instant power, it takes a fraction of a second, sometimes more depending on which gear you are in, to get the exhaust gas pressure high enough to spool the turbos thus giving you boost. People refer to this as turbo lag. Granted, with a smaller turbo, this lag isn't drastic, but it is noticeable.
Also, generally turbos are more tuneable and possible of higher hp numbers

Superchargers on the other hand are belt driven. Therefore, the power is always on hand the instant you hit the gas. They also offer alot more low and mid range torque. The disadvantage of this is that it drains hp from the engine as it produces hp. Granted, it produces more, thus making it effective, but it does put a significant drain on your engines crank.