YAML is visually easier to look at... It is easy for a human to read.
YAML has the ability to reference other items within a YAML file using "anchors." Thus it can handle relational information as one might find in a MySQL database.
YAML is more robust about embedding other serialization formats such as JSON or XML within a YAML file.
Inspiration
Google is heavily relying on yml files in it's Google Cloud Platform (GCP)
Goal
As a developer, I want to convert all configuration files to yet another market language (YAML), so that I can improve the readability.
Consider
Inspiration