Quick settings - add Show dashboard, Lock screen, Screen off
I use a always-visible side panel and I want to limit the number of buttons on my screen to save space so I prefer Quick settings.
In a perfect world, I'd love to be able to add to Quick settings anything that I can put to side panel (use it like a button sub-folder) but there seems to be a reason why not all things can be added there. In that case, my preferred ones are Show dashboard, Lock screen, Screen off. :)