Beau makes and excellent point, we all have individual preferences, skillsets, goals and pleasure points. I do agree with Brian, the single is the 'one' to learn, however that wouldn't be true for all practitioners necessarily.
Years ago I started out just trying to get the damn line out there far enough. The double and snap were my saviors. Then I got consistent with the single, and my left hand came along too. Now, as funny as it seems, when the cast I am doing gets easy I switch to another cast! Call it crazy but I figure "every minute in a groove is a minute I could use to improve". If Ben Franklin was a speybrotha I'm sure he'd coin a phrase like that.
I listed the upriver snake as my favorite but by no means is it the 'best' or worst, easiest or hardest, and it won't necessarily catch more fish. It's just fun