It's an often interesting concept - "Real Estate Company" - Yes, not all realty firms are created equal. As you can see; some firms have International presence - while others maintain a local, hometown persona.
The bottom like is that more likely than not- Your license will be registered to A Company - BUT you will be employed as an independent contractor. So, yes your affiliation is with that company and you are supervised by that branch or locations Broker or Manager of Record.
There are MANY "Best Companies" in MIAMI. Some of these companies will out-right tell you that they are the BEST. Those are the ones to stay away from!