I'm not sure how Xmonad and AwesomeWM handle multiple monitors, but in Qtile you have a single set of groups (analagous to tags or workspaces) shared between yo

I'm not sure how Xmonad and AwesomeWM handle multiple monitors, but in Qtile you have a single set of groups (analagous to tags or workspaces) shared between your monitors, and each monitor displays one group.