Comment Re:most useful? (Score 3, Informative) 77
To my knowledge for screen:
-screen can target ptys/realserial ports. Useful alternative to minicom or similar. Nowadays it's the most likely application to be installed 'by chance' with that capability (once upon a time, I would generally find cu, but that's almost never around by chance anymor)
-a split screen can have different people typing concurrently in different panes.
tmux more gracefully handles multiple terminal sizes connecting and tends to keep you from leaving a shared attach behind when you start trying to do split and such. tmux naturally understands terminal title set sequence and has more handy access to a lot of the best tricks. So 95% of the time tmux hits what is more important to me, but I do get a bit put out when I have a desire to take care of one of the above cases.