Is there anyone more knowledgeable than me (not hard, honestly) who's up to the challenge of building, running and then writing a comparison of these?
All are of interest to me, but I strongly suspect beyond my skills. I failed to get an instance of Alpine fully running and that's relatively mainstream.
Sta.li: statically-linked Linux from the suckless.org folks:
KISS Linux: one of the most minimalist full-function distros I've seen.
And something I stumbled across looking for the above two — Monolinux: