In reality, there is probably no difference. It may be true that a S-Corp provides more tax advantages (namely pass through taxation) than LLC that has multiple members and is defaulted to a partnership. However, single member LLCs, or other entities that are members of an LLC – can easily “disregard the entity” and elect S-Corp (pass through) status for tax purposes. This is the best of both worlds. Because each dentist will set up his or her own professional corporation, and will be the only shareholder / member – S-Corp tax status is the optimum election under the current tax code.