DVD Talk Forum - PGR3 or NFSMW for XBOX 360?

OK,
I'm only going to be able to pick up 1 driving title in the near future for my soon to arrive 360. The question is, should it be Project Gotham Racing 3 or Need for Speed Most Wanted?
I'm looking for a fun driving game I can play solo, but also something I can play head to head with friends when they come over. Being able to take on my long distance buds over the internet would be great, too.
I don't have a lot of experience with the project gotham racing series. I loved need for speed WAYYY back on my PS1, but haven't played any of the more recent versions of this title either.
Any suggestions?