As someone who is in your exact position at the moment, please allow me to share my experience with both machines. I've had the unique opportunity to take both home and use each for a while, and I have made many observations that have helped me to decide.
At first, I thought I would like the Vaio Pro 13 more because I would rather use Windows, it has a touch screen, and it has HDMI out for hooking up to an external monitor w/o any adapters. Once I started using it, I noticed the WiFi speeds over 802.11n wireless were very slow compared to my (also WiFi-enabled) desktop. After testing the MacBook Air, I noticed that the Air's WiFi performance was far better than the Vaio's, especially when at a distance from the router. The Vaio has had many, many reports of less-than-ideal WiFi performance, and I can vouch for that. Sony has released multiple driver updates in attempts to solve the issue, but even these fixes can't give the Vaio performance to match the Air's. This has lead me to believe that the Vaio has a hardware issue rather than a software one. That being said, the Vaio is still a great machine, and will be that much more of a competitor to the Air if/once the WiFi issues are worked out.
If you're dead-set on using Windows, the Vaio isn't your only option. I'm currently running Windows 7 on the Air, and it isn't even remotely as bad as people make it out to be. Battery life is still amazing (I haven't gone less than 9 hours so far, even during moderate usage!
), and Trackpad++ will likely appease you if you're not satisfied with the trackpad performance.
Some of the pros and cons that I have found for each machine:
Vaio Pro 13
Pros: Gorgeous 1920x1080 touch screen, smaller footprint, lighter than the MBA, decent battery life, good keyboard, full-size HDMI out, SD card doesn't stick out of slot, comes in black
Cons: Trackpad can be frustrating at times with finicky Synaptics gesture support, subpar webcam, fan can spin up even during light usage and create unwanted noise, unresolved WiFi issues that could cripple the machine's usability when ethernet cannot be found, carbon fiber construction has lots of flex which may be disconcerting for some
MacBook Air 13"
Pros: Best-in-class keyboard and trackpad, ability to run both OSX and Windows, longest battery life of any ultraportable to date (even on Windows!), better WiFi performance out-of-the-box than the Vaio, aluminum construction offers better perceived durability
Cons: Only 1440x900 resolution display, no touch screen, no HDMI port, adapter required for video output to anything other than a Thunderbolt display, SD card sticks out of slot
TL;DR Choose what you think will be best for your needs, but be warned that the Vaio still has unresolved WiFi issues. Both are very similarly priced (although Apple may have the advantage with Back-to-School pricing). As for me, I am most likely going to be getting a MacBook Air and running Windows 8 for school.
At first, I thought I would like the Vaio Pro 13 more because I would rather use Windows, it has a touch screen, and it has HDMI out for hooking up to an external monitor w/o any adapters. Once I started using it, I noticed the WiFi speeds over 802.11n wireless were very slow compared to my (also WiFi-enabled) desktop. After testing the MacBook Air, I noticed that the Air's WiFi performance was far better than the Vaio's, especially when at a distance from the router. The Vaio has had many, many reports of less-than-ideal WiFi performance, and I can vouch for that. Sony has released multiple driver updates in attempts to solve the issue, but even these fixes can't give the Vaio performance to match the Air's. This has lead me to believe that the Vaio has a hardware issue rather than a software one. That being said, the Vaio is still a great machine, and will be that much more of a competitor to the Air if/once the WiFi issues are worked out.
If you're dead-set on using Windows, the Vaio isn't your only option. I'm currently running Windows 7 on the Air, and it isn't even remotely as bad as people make it out to be. Battery life is still amazing (I haven't gone less than 9 hours so far, even during moderate usage!
Some of the pros and cons that I have found for each machine:
Vaio Pro 13
Pros: Gorgeous 1920x1080 touch screen, smaller footprint, lighter than the MBA, decent battery life, good keyboard, full-size HDMI out, SD card doesn't stick out of slot, comes in black
Cons: Trackpad can be frustrating at times with finicky Synaptics gesture support, subpar webcam, fan can spin up even during light usage and create unwanted noise, unresolved WiFi issues that could cripple the machine's usability when ethernet cannot be found, carbon fiber construction has lots of flex which may be disconcerting for some
MacBook Air 13"
Pros: Best-in-class keyboard and trackpad, ability to run both OSX and Windows, longest battery life of any ultraportable to date (even on Windows!), better WiFi performance out-of-the-box than the Vaio, aluminum construction offers better perceived durability
Cons: Only 1440x900 resolution display, no touch screen, no HDMI port, adapter required for video output to anything other than a Thunderbolt display, SD card sticks out of slot
TL;DR Choose what you think will be best for your needs, but be warned that the Vaio still has unresolved WiFi issues. Both are very similarly priced (although Apple may have the advantage with Back-to-School pricing). As for me, I am most likely going to be getting a MacBook Air and running Windows 8 for school.