My primary computer is iMac 27" i7 fully loaded machine. But sometimes I don't like to sit in front of machine and edit. Or sometimes I'm on the go and feel like having a device that can be loaded with Photoshop and Lightroom to carry on with my editing work. Is it possible for iPad Pro 12.9" to be good as a secondary source to be used with iMac to take on some of Photoshop and Lightroom work ? Are there any apps that allows me to use my iPad Pro and share my iMac screen and resources to do editing (as long as I'm at my home) ? Need to decide between iPad Pro and Surface Pro 4.