>
>v6 vs v7 PDP-11 vs Vax much less vi vs emacs.
>
Amusingly, as weith many of us, I got my start with "ed."   I never 
actually learned vi.   By the time I was ready to move up to screen 
editors, the emacs-ish things were available to me.
I did a small stint using INed (Rand-editor variant) at one job.

My employees always found it amusing that if I was stuck on a machine 
that didn't have some emacs-ish thing, I just used ed.    They marvelled 
at my ability to complex substitutions with the s/// regular 
expressions.