Unity, definitely. Having window menus appear / disappear right in the top bar, much like the beloved, glorious Amiga did in the golden days of computing :) mak

Unity, definitely. Having window menus appear / disappear right in the top bar, much like the beloved, glorious Amiga did in the golden days of computing :) makes it probably the closest you can get - that is, without turning on your old Amiga or installing AROS :) I don't use Unity though - KDE suits my taste better. But that's the beauty of Linux, you get to choose whatever desktop you prefer.