If you're using it while traveling, MBP has an internal card reader... one thing that I really miss on my Macbook compared to my PC

or if you're using it for video editing at all, you'll want the pro. For general consumer use, IMO a Macbook is fine (I use mine as my main computer while away at college now and have a 19" screen I hook it up to if I want more display real estate.)
Also worth noting, if you just want it for away from home and don't mind a smaller screen, I love my Samsung NC-10 netbook