For the same employer, the same medical insurance carrier, and the exact same plan, the rates are the same regardless of which broker presents them under the carrier's standard rating arrangements.
Medical insurance premiums are determined by the carrier based on applicable factors such as the employer's location, employee ages, participation, plan design, and, where permitted, claims experience. They aren't determined by whether your broker represents a large national firm or a smaller independent agency.
What can differ significantly is which plans each broker chooses to recommend. Two advisors may receive the same carrier proposal but present entirely different options, creating the impression that one has obtained better pricing.
The distinction matters: the broker doesn't set the medical plan's rate. The broker helps determine which plans you consider.
Ancillary and voluntary benefits may involve different pricing and compensation arrangements, so those comparisons deserve separate consideration.