How to sort posts on Reddit by number of comments? I'd find this more useful than sorting by votes.
Unfortunately, reddit doesn't offer many sorting options. You are forced to use their algorithm of what is and is not considered "relevant." The number of comments on a post is a factor in the algorithms for hot and rising, but that's it. The only way to achieve what you are after is via a third-party service, and I am not aware of any designed for that purpose.