Either Apple or Microsoft, or maybe even both, needs to launch a large scale study. Pick 1000 people off the street, pick 100 people looking for a computer at BestBuy, and get 400 people working at some big corporation. Just regular people who use their computer on a daily basis but don't know anything about hardware and stuff. Give each and every one of those 1500 people a free Mac and PC, and have them use it for a couple months. Let them use it for whatever they want, if they need Adobe, give it to them. At the end, ask them which one they want to throw out.