I pasted one together out of parts (a Franken-camino?), because there were things I wanted to see on several of them, and I wanted to avoid large crowds--so I tried to walk the parts I wanted to see on the Frances early in my time frame. People who want more company along the way would probably not follow the path I designed but that is the beauty of it--there really aren't any rules, unless you want a Compostella, and then it is simple...walk the last 100km and get two sellos a day...whatever else you do is up to you
I read an over-view of each route, looked up things to see along the way, and from this forum had an idea of where people were less likely to be and when. Changing routes frequently meant I met different people, but it also meant I didn't share the road long with any of them until the Primitivo...and even then I walked some steps out of sync. Most people I think like sticking to one route, and making friends on it that you run into again and again... which route/when you walk depends on what you want out of it.
Choosing a favorite is like choosing a favorite child...I love them all the same but differently. But maybe I loved the Primitivo just a little bit more (just don't tell the other routes). It suited me.