If you can only afford one computer and you want a portable for Photography, its hard not to recommend the best MacBook Pro you can afford. For those of use lucky enough to have several Mac laptops and desktops around the building to use, then for heavy Photoshop its the MacPro and for lighter work my old eight year old MacBook Pro. The little MacBook most people including me dismiss and look more towards the Air for light work, but I was looking at the Geekbench scores and its amazing how computers have progressed. That little underpowered laptop is nearly twice the power of my old laptop so if your just after something for occasional work it is an option but remember that USB-C hub.