normal application tray and buttons for close, maximise and minimize
dolphin ! (But any capable filemanager with spacesaving UI, extensions, an editable location bar, drag/drop dialogs, selection mode, preview, pinned favourites, kfind integration,… would do)
are all simply better than the GNOME counterpart. Also things like the clickboxes of decorations actually reaching to the top corner is something so obvious its crazy that GNOME simply ignores that and you need to directly point to the “x”.