The mainstream view is that php-fpm has better performance than old CGI, and is much better for domain isolation (no suexec hacks needed). But it is also more buggy in operation. It hangs from time to time, requires monitoring that restarts FPM when that happens.
Old CGI is nice in that you can easily set up Apache to launch any kind of executable, not just the one lagnuage script that the Fastcgi process manager supports. So you can have bash// python scripts, C binaries, all accesible through the web page.
Old CGI is nice in that you can easily set up Apache to launch any kind of executable, not just the one lagnuage script that the Fastcgi process manager supports. So you can have bash// python scripts, C binaries, all accesible through the web page.