I’m currently using nextcloud:26-apache from here because some nextcloud apps I use is not compatible with v27 and v28 yet. The apache version is actually less hassle to use because nextcloud can generate .htaccess configuration dynamically by itself, unlike php-fpm version where you have to maintain your own nginx configuration. The php-fpm version is supposedly faster and scale better though, but chance that you won’t see that benefits unless your server handles a large amount of traffics.