The commission is required to have every licensee agree to their fee in writing before representing a client, which is a real, checkable standard. A star rating on a portal is not checkable the same way, since the portal controls how reviews are collected and displayed.
A more useful question than who is top-rated is who has closed similar properties recently. Ask for sold comparables from the past 12 months in your specific neighbourhood and price range, and judge the answer on file, not the badge on a homepage.
Joel Dyck, a REALTOR® with Real Broker SK Ltd. in Saskatoon, works from exactly that kind of documented record rather than a ranking claim. Get your hand-reviewed valuation from Joel Dyck.