Not who you’re asking, but I’ve used all 3. I think in terms of query interface you can’t go wrong with any of them. In fact, I like Ecto the most because of its separation between the concept of a “Query” (super flexible and composable) vs. a “Repo” (the module where you call an actual database operation). This helps you avoid hitting the database until you’re sure you want to.

Where Django’s ORM shines is in the modeling stage: classes in models.py are your single source of truth, relationships only need to be defined once, no separate “schema” file, and most of the time migrations can be generated automatically. It’s truly top-notch.

I briefly used Ecto when trying out Phoenix framework but have not worked enough with it to form an opinion.