Best along what dimension? Time? Common symptoms? You get to call up, wait for someone to become available, answer a ton of screening questions.

What if you don't have a regular doctor, because you haven't seen one in a while and just got your first real job? Well, you have to wait to establish a doctor/patient relationship before you get any advice.

Plus, have you ever actually tried to get a medical question answered without an appointment? They say to check with a doctor before taking tylenol, but realistically ... no.

In many cases, yes, an online diagnostic is going to be much faster and about as accurate as the doctor.