I like the Windows UI more than Ubuntu. The taskbar on Windows 7/8 I prefer, for some reasons the icons appear to look a bit smoother, or is that just how Windows displays them? I prefer the Window styles on applications with the Exit, Maximize/Restore Down and Minimize than on Linux, the border for applications... I even prefer the Windows controls to linux ones, as basic as they may be. It's probably because I grew up with Windows. I've used linux but i removed it within a day, it wasn't as fast on my old netbook with 1gb ram and windows 7 ran amazing on it, so why can't Ubuntu? I thought Linux was meant to be more lightweight?
Anyway, UI is a big thing for me. UI and functionality. It has to do the job, and have a great UI or I won't find it appealing and be interested. If Microsoft Office looked horrible I wouldn't bother with it. HOWEVER, I have to admit, Linux security will always be better than Windows. The average Windows user has to reinstall Windows at least once or twice every year or so, some people talk it in months. Ubuntu is so clean it's rare to have too, the updating doesn't have the stupid problems Windows does or the rebooting cycle bugs (which I whom was a victim on Windows updates and had to reformat and lose all my data because I installed a Windows update ...), and Linux is nice, simple and more easy-to-use. The login screens/splash screens on Linux look so much better than on Windows. If only they had a taskbar like on Windows 8, and made a better window style, I would install it.