A couple years ago I built toy backends for the same app using both technologies so they could be compared as-directly-as-possible. The code* takes you through the architectural decisions: https://github.com/sastraxi/great-bear-postgraphile and https://github.com/sastraxi/great-bear-hasura

Edit: I forgot that I was trying a "learning repository" pattern where I put longform comments throughout the code. A little more difficult to discover than markdown, as I've learned.