You get better doctors and better care when you have money and better insurance. When you can pay for a doctor through insurance it probably means they are a private practice.

Public doctors are often overwhelmed. They have A LOT more patients and will often see them for a shorter amount of time. When you have more money the doctor will tend to see you for 30-45 minutes a session. When you don't have money, most sessions are 15 minutes.

When it comes down to it, money talks.

A good doctor will reduce the amount of medications you are taking so you're only taking one medication for a specific problem. A good doctor will be aware of drug-interactions and drug psychosis. A good doctor is not overworked. Most doctors are.