Well, on another thread, nobody was able/willing to argue against my argument:
Ubuntu costs 0$; Windows costs about 150$
If you try to find out how many more times expensive Windows is over Ubuntu, you come up with infinity.
Windows cannot be infinity times better than Ubuntu, therefore Ubuntu is always the better choice.
Until someone does, I'm not going to argue against/for Ubuntu 
Back on topic: I do like the Ubuntu interface, not because it looks pretty, but because it is functional. You have all of you program launchers and taskbar icons at the top, and all of your currently open windows at the bottom. Plus, multiple workspaces are nice. I know that you can use a program on Windows to make multiple workspaces, but it works better if it is included in the OS.
