I'm not sure why everyone goes so crazy over tmux, I've been using screen for 20 years now and it's generally installed everywhere by default, even on remote servers I don't have root on, so I don't have any real reason to switch. 99% of both of these things both do what I need daily, so I usually don't use tmux unless screen doesn't happen to be available for some reason and tmux does. But more power to the devs for wanting to rewrite screen to be more modern with some additional features.