I would really like it to be vi or vim. I mistakenly typed some vi commands in the default editor for visudo, which I believe is nano, and broke /etc/sudoers so badly I think I am going to have to burn a new image and start over.
I've been able to run visudo again by doing pkexec bash but I broke something in the default line entry and I haven't been able to repair it correctly and sudo won't run.
mcedit
is a nice alternative if you don't actually want to remember vim/nano/emacs shortcuts