When to use a Config File vs Data File?

A question for other plugin developers. I'm creating a new plugin that will have a list of custom settings based on a class. The list will expand and change dynamically based on user input. My gut is telling me that static settings belong in a config file and dynamic data in a data file. But I wanted to ask others, when do you decide to use a data file vs using a configuration file to store settings and data?

Cheers,
Fire

 

A Configuration should be something that is used to change small things, like toggling something, changing the value of something static in the plugin.
Data files should be used to store data, aka having a JSON section associated to a player, or anything.