In my location, many doctors prefer PPO. Less of a pain.
I have PPO and I can go to any doctor I want. Only thing is, my company is small and most of the employees have insurance through their spouse, so those of us that have insurance get a heavy copay and deductible......my copay is $30 per office visit, $3000.00 deductible + a patient% for hospital stay or surgery.
But it is almost impossible to be without insurance. You spend the night in the hospital for observation and that could cost a nice $6000.00. That's hopsital only and does not include the fee for the doctor that came in, checked your temp, and said hello to you while you were in the hospital.
Got to watch those plans with an annual maximum too.
On HMO, I would have to select a PCP and stay with that PCP or get charged an out of network charge if not approved by my PCP, or the HMO plan. You can't just drop into the ER without it being approved either.
There are doctors that treat cash patients and give discounts, but the doctors try to guide these patients without insurance to a county clinic for needed shots to help out. I know for a fact that children's immunizations and routine visits can cost a big chunk, and you wouldn't believe the cash patients that won't go to the clinic because they are embarrassed to be seen there.
If you are self-employed the you might want to check into a plan without "routine care."