Always a tough call — really depends on what you need the most. Power, it’s the Pro. Portability, it’s the new MacBook (though you’ll undoubtedly need an adaptor for the USB-C to USB connections — so for some, the Air is still the better portability option).
I have and really like the new MacBook, but it is fairly slow for many tasks. Because I mainly do everything on the web, I’m okay with that. But many aren’t. Also, I assume a new one of these will be coming out within a few months, hopefully much faster — and maybe even another port :)