Mostly enterprise teams and intermediate devs from my experience. I lead the API platform for a popular e-signature company, and a postman collection is the first thing devs ask for. Even when we point them to our docs, they'd rather just import a collection and start hitting endpoints immediately.

Haven't heard of Bruno until now. Looks like a solid offline-first tool. I don't see a public collection or web runner, and it looks like it supports GitHub-based sharing. Postman on the other hand, their public API network (or whatever they call it) along with the web runner reduce a lot of friction for API vendors like us and for dev teams who just want to quickly play with the API in the browser, especially during their evaluation stage.