Ask HN: Macbook Air or Pro for Visual Studio dev machine? 12 years ago
I was in the exact situation before, and landed with an Air (top spec).
It really depends on what things you wanna run on it. A VS, even inside a VM, the Air can handle the job easily. But if you want to run more programs on it, it will burn!
The upside of Air is the battery is awesome endless, giving that you don't have a lot programs running. On the other hand, and is the reason why I'd choose a Pro in the future, the retina screen!