I use both (the MBP as a personal laptop) and the MBA at work and I must say that I prefer the MBP. The MBA is a nice enough to do light weight stuff on it but

I use both (the MBP as a personal laptop) and the MBA at work and I must say that I prefer the MBP. The MBA is a nice enough to do light weight stuff on it but the RAM on it is not enough for today's day and age. Also I find that as a person with rather large fingers, I keep pressing the power key instead of backspace (delete). On the other hand, the 15 " MBP is too big for any sort of meaningful work on a plane.