13" Although personally I went with an 11" Air. It's docked 80% of the time so I don't have an issue. When I do need to be mobile or code on the couch or someth

13" Although personally I went with an 11" Air. It's docked 80% of the time so I don't have an issue. When I do need to be mobile or code on the couch or something the portability is sublime. Love it. I do a lot of .NET so I have VS in a VM and it doesn't skip a beat. Took a long time and read countless articles and I was hesitant the 11 wasn't going to be enough, but it is in my use case. So happy with it. There isn't a hard and fast rule to what you need and what works for one person won't work for another. The only way you'll know is to try it for yourself. And even then you could argue either way depending totally on the context so it's a tough call for you to make.