I mean … probably depends on local preferences. Every project I've ever worked on used .yaml. .yml feels like .htm to me. DOS is long since gone. But, Github

I mean … probably depends on local preferences. Every project I've ever worked on used .yaml. .yml feels like .htm to me. DOS is long since gone. But, Github seems to think they're about the same, with a lead for .yml: 23.9M hits for .yml, 17.8M for .yaml.