No advantage both just double the cost.
I've used both in the past and prefer CoachNet. Great service every time I've called.
It appears they both use a lot of the same roadside assistance/towing companies. It's the level of customer service I receive on the phone. CoachNet calls back to check in with you while you are waiting on the tow truck.
One big issue I have with Good Sam is the amount of junk mail I get at home and the amount of email junk they send me.
As far as your other questions check their websites, both offer multiple plans at different price points. I use CoachNet's basic plan at $79.00 per year. Their websites will give you comparisons of the different plans they offer.
CoachNet Let me google that for you
Good Sam Let me google that for you
US Navy Vet, Liberty Tree Member of Oath Keepers, NRA & VFW Life Member, Alaska EMT.
2009 Safari Cheetah 40 SKQ
2009 Winnebago Chalet 231CR