Which laptop is better: Toshiba or Lenovo G530?

Considering that Lenovo has XP prof (hard to find and very in demand!) and Toshiba comes with regular Vista. The only other difference is Lenovo has 3GB RAM but Toshiba has 4GB RAM. All the rest is same. Except price: Toshiba is 499$ (plus tax) and comes with a promotional laptop backpack. Lenovo is 599$ (plus tax). Both are Intel Core 2 Duo. I heard Intel Centrino is much better though. PLEASE HELP!!!

Toshiba… Regular Vista…. 32 bit?? if its 32 bit it doesnt matter because the computer is only going to recognize 3GB of ram period…

Lenovo s10e Hama Sleeve / Bag