AFAIK nginx unit would still require to have an nginx in front, so they are in different weight category with openresty.
It looks like it's more of a replacement to good old NGINX+Apache set up where there would be mod_php, mod_cgi, mod_perl and .htaccess on backend to serve the app.
It looks like it's more of a replacement to good old NGINX+Apache set up where there would be mod_php, mod_cgi, mod_perl and .htaccess on backend to serve the app.