By "flexible", I primarily mean Apache's module system vs nginx's "compile all the things" approach. Upgrading a component in nginx means recompiling the whole

By "flexible", I primarily mean Apache's module system vs nginx's "compile all the things" approach. Upgrading a component in nginx means recompiling the whole webserver, whereas Apache modules can be managed separately from the httpd executable. I'm curious about the reverse proxy comment, though; mod_proxy_balancer generally does the job just fine. I do agree that nginx is easier to set up as a reverse proxy, though.