If you run CloudLinux or LiteSpeed, it'd suggest using lsphp, else - php-fpm. I wouldn't suggest standalone nginx for shared webhosting due to lack of .htaccess support. OpenLiteSpeed is recommended WordPress/Joomla/OpenCart hosting (CMS that they have LSCache plugin for), as it lacks full support of .htaccess too, but should have no issues with mentioned ones, due to RewriteRules support in .htaccess.