I wish I could justify having both but I have a MacBook in the office, which I no longer bother to bring home since I have the iPad and MacMini at home, for the few times I need a computer. So it's one or the other. The sacrifice I would be making would be battery life, which would only be an issue on long flights. In terms of size and weight, it's a wash as far as I'm concerned. I like the apps on the iPad so for the moment that is a bit of an advantage to the iPad but that would change hopefully, once the Mac App Store is up and running. Computing power, storage, ram and typing ease go to the MBA. My biggest complaint with the iPad is the ram and typing. The typing will always remain but the next gen iPad will likely fix the ram issue. The MBA cost more but not enough to prevent me from getting one so that is not a big issue.