Depends. Are either of those companies bootstrapping a for-profit startup and trying to dupe people into contributing free labor prior to their inevitable rug pull/switcheroo?
Do explain how you dupe people into contributing free labor and do a switcheroo with an open source project. All the app does is just provide a nice UI for running models.
Ok I tried it out and as of now Jan has a better UI/UX imo (easier to install and use), but Open WebUI seems to have more features like document/image processing.