MBP 13 or MBA 11.6

I need to buy a laptop.
It has to run Bootcamp with MATLAB, SolidEdge and edit 100MB PSDs in Photoshop.

Will these laptops have better performance than my PC?
**PC, **3.2GHz P4, 2GB RAM

MacBook Air 11.6", 1.4GHz C2D, 2GB RAM
MacBook Pro 13", 2.4GHz C2D, 4GB RAM