What I really like about Caddy is their better syntax. I actually use nginx (via nginx proxy manager) and Traefik but recently I did one project with Caddy and found it very nice. I might get the time to change my selfhosted setup to use Caddy in the future but probably will go with something like pangolin [1] because it provides alternative to cloudflare tunnels too.
[1] https://github.com/fosrl/pangolin