Price is what has kept me from moving from Windows to Mac. I can buy three Windows systems for the price of one mac Book! The thing is my next lap top will likely be a Mac!

You want to know how well the Mac 13" will perform, I can't say for sure but what I can say is my little 11" MacBook Air runs Lightroom CC better that my 15" Win 8.1 (now Win 10) system that has 16 gig of Ram and 2.8 GHz processor. I'm not sure why - if it's the operating system or what but that little MacBook Air does wonderful with Lightroom, while the Windows system leaves me waiting for it to catch up.

I picked up the 11" MacBook Air to replace my iPad - I find it is my most used system. You will likely be happy with either MacBook 13 or 15 inch. If it is portability you need and screen size you want then think about using a second screen when in your office. On my desk I can connect a second monitor to my MacBook Air and it works fine.