You need to be informed to know which doctor is better. I generally try to follow the advice of my family doctor, but that’s because I’ve made an informed decision on past experiences where I double checked him.

But that’s easy with a doctor you have a long term relationship with. I imagine it’s different eg. if you get cancer it’s probably going to just be a part time job to keep informed on all the doctor’s recommendations, and getting second opinions sounds like it would be time prohibitive. I don’t know of an easy way around this though.