Default movie version

I’ve pre-transcoded every movie to 720p, so I can choose the version to play.
Is there a way to say that the 1080p version is the default one? It seems random which version is pre selected for each movie, which is kind of annoying.

You know, I’m not sure how this gets decided actually. I wonder if it’s based on the “first” version that gets imported, or if it’s a naive sort of some kind.

I could imagine 720p comes before 1080p because it’s four characters instead of five.