I'll take neither, thanks. The best user interface is a bunch of physical buttons/keys arranged in a board on my desk. A "graphical" UI seems to require similar brain engagement as, say, navigating the index of a book.

Physical keys, on the other hand, engage a completely different part of the brain that is capable of "muscle memory". Ever seen someone knitting and watching TV at the same time? Or controlling a car while simultaneously watching other traffic and following road signs? It's the same thing. A keyboard allows you to express your intention to the computer without actually engaging the "thinking" part of your brain at all.