I actually would advise against both the Mac and the Sony.
- I have a macbook pro, love it, and if I could I would never ever use another computer again. On the other hand, most med schools I've been to strongly suggested students buy PC's because most medical software tends to be PC-only. Sure, you can run Boot Camp (I think that's what it's called) on your Mac and run Windows on it, but in my experience it really slows things down and if you're going to be using your Mac as a PC, you might as well get a PC.
- I had a Sony before this one and it was absolutely awful. The first thing you have to do when you get a Sony is remove almost all of the bloatware (random software they add in there) that comes with it. Nowadays you can pay EXTRA to have less software pre-installed (uhm, thanks Sony) which is just ridiculous. Within a year of owning it, the computer was painfully slow and my trackpad was no longer working (every time I touched it while the computer was doing 2 things at once, the cursor would go nuts and click everything on the screen). Yes, the screen is stunning, and the design is unparalleled, but I had a horrible experience with it.
When I was making this decision, it was strongly suggested to me that I buy a Lenovo Thinkpad. I bought an X301 and so far it seems to do great. It's tiny, super-light, and Thinkpads have the best reviews around. Apparently, they last forever. We'll see if that's true...