The distinction is that Caddy is the only webserver* that enables HTTPS by default. All others don't attempt to enable HTTPS by default, they start with HTTP and you need to add config to make it use HTTPS. Nor do they enable ACME by default. With Caddy you only need to tell it your domain name and it'll do the rest.

* popular webserver anyway; we can't reasonably count yours with only 6 github stars that we've never heard of :P