Windows is a generic os, just like android. They are made for infinite hardware configurations meaning they will not fully take advantage of a singe hardware setup, they are designed to run tons of different hardware. Therefore they do not and will not offer the performance a Mac offers. Apple makes the hardware and OS, so they work flawlessly. It's not just about aesthetics with OSX, everything works like the aesthetics do, everything just runs better. Argue till your blue in the face but I work on windows computer every day, They are nothing compared to Mac's and never will be. I get home everyday and smile knowing I get to get on my beautiful, high quality, super fast macbook pro instead of some hardware thrown together to kinda work.
Well, it is certainly true that Windows is a generic, bare-bone OS, but your statement that Windows offers less performance than Mac is simply... wrong (and that very mildly spoken). Both Linux and Windows offer same or superior performance to OS X.