Im thinking about buying myself a PDA for Christmas, but have a few questions.

First, which is better? Palm or Handspring?

Second, What can I do with it? Can it really save me time? Right now I can drive, talk on the phone, and take notes on paper. Can I do this on a PDA? Or will I be taking notes on paper and transferring, which would be non productive.

Basically, if you've got one, tell me what you use it for and is it worth it.
Thanks in Advance!