KDE for me. As much as I hate windows, I like the floating windows, task bar and tray. KDE has that out of the box and lets me tweak all the little annoyances away.
Of all the things I hate about Microsoft Windows, the GUI design is not one of them. The content of those windows is janky as all hell. But the floating windows, taskbar, and tray? Those are all great.
I love the minimize all windows button. It is so small and functional, I always use the KDE Widget that copies it, and IMO, KDE should use it by default