You don’t “submit changes to the osm team”, you are actually editing the live map. Reviewers can revert changes, but there isn’t some process a change must go through, everything is live. Most apps don’t use the live data, but regular snapshots of it, that’s why it seems like there is some processing behind the scenes, but it’s up to the renderers and apps, not by osm.

Answering your question: OM is an app for navigation, and using the map, functionality for contributing data is very minimal and limited. SC is an app for contributing, nothing else, e.g. you can’t plan a route there. If you want to contribute, use SC. If you just navigating with OM and notice something is missing, use OM, if it’s quicker than opening another app.