I'd choose the iPad Air 2 because I need a portable iOS Apple device to connect to my DAW for live use. I'm a musician and singer songwriter so the integration of my music software on my iMac and my other instruments between the iOS devices like the iPad is very convenient. I need something that can run midi synths and logic remote and I don't necessarily need a laptop to achieve the control I desire; an iPad Air 2 would be the perfect solution.