Somewhat tangential, but I'll take Haproxy anyday over Nginx for the simple fact that Nginx is a a Freemium product, rather than a true open source libre software entity.

I somehow failed to realize over the years that their Pro product is $2500 (given the ubiquity of usage in the OSS community).

I am not contesting it's value, as it brings several vital features to the table, but I feel that it should be mentioned.

Familiarity with Haproxy's dead-simple configuration (although this Caddy seems as simple as pie!) and it's reliability and scalability leads me to also prefer it, even in Kubernetes land, so I do apologize for giving Caddy short shrift in this comment.

It appears that Caddy differentiates merely on free downloads and business SUPPORT plans, which is much cleaner feeling to me, so I applaud this effort to re-direct peoples attention in front-end land.