If you search here on the forum I think you will find positive and few negative remarks for both. And both much preferable over AAA, insurance attached services, etc.
Myself, I have been with Good Sam for several years - having used their services several times for both the MH and autos, with good results. That said, I have just enrolled with Coach-Net primarily due to the technical assist service feature.
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.