It depends. If you are asking what the advantage of being an employee physician of a group owned by another or others, there can be many. You don't have any owner's risk or financial responsibility and the management is left to the owners and those they hire. If you aren't sure you want to stay in a particular area, employee practice can be advantageous. Of course, most groups will have a compensation structure that pays operating profits to its owners, which is reasonable as they are bearing risks on behalf of the business.
Everything depends on how the revenues are shared and how the employees are paid. Generally, for an employee, greater risk should have greater upside in sharing profit.