The other axis (ie other than who/what renders the HTML) is how the http
content is fetched; in the case of the now defunct W3 and the present
EWW, this uses the url library, whereas w3m uses w3m to fetch
content. If I had a vote, I would  have Emacs to integrate something
like CURL's libcurl in some shape into Emacs and provide a light-weight
Lisp binding 
to that functionality -- would improve the Web  that is Emacs usable
much better (here, Emacs-usable Web ==Web -- JS and parts of CSS)

-- 

Thanks,

--Raman(I Search, I Find, I Misplace, I Research)
♈ Id: kg:/m/0285kf1  🦮