I don't know what Windows 9 will be like but I tried 8 and it is straight up awful.  It is not smooth at all and why they removed the start button is a head scratcher.  I am sure it can be hacked and changed that way but I am just not into having to do all that to make it useable.  It took me forever to get to the control panel.  OS-X has its issues and quirks, but I will take it all day over Windows 