Hi,
Nginx is supported now by EGroupware Packages under Debian/Ubuntu (not under RPM based systems!).
You just do an install like:
apt install nginx php-fpm egroupware-epl
Please note you need to explicitly name both nginx and php-fpm, to trigger the Nginx install.
Nginx is better performance-wise and recommended for bigger installations, only drawback is it’s configuration is different from Apache. It is also supported by Let’s Encrypt and our Nginx configuration file in /etc/egroupware/nginx.conf has points how to enable TLS via Let’s Encrypt.
Ralf