I'm not a fan of Dell at all so just take my advice and stay away from them..
But from personal experience, I can't recommend either:
I've had a 16,4" Vaio laptop for bout 2 years and it was pretty expencive when we got it, the specs would be 4 GB of DDR2 RAM and a Intel Core 2 Duo CPU @ 2.27 GHz... And it runs damned slow for the price we paid, battery barely lasts 2 hours when idling with the power saving scheme in Windows 7! It also weighs a ton to carry..
I'd rather suggest you to go with HP, Packard Bell or Asus.. My brother got himself a 30% cheaper Packard Bell which completely outperforms it in seemingly every way..
Another example would be the uber small Vaio my mom got a while ago... a week later we found a HP with the same specs and size.. only real difference would be the price which was half of what the Vaio had costed.