Good Sam and CoachNET are both big names. They use the same general network of providers and you either get a rock star or you get some doofus who can’t keep his finger out of his nose. Because of that, both have war stories and both have great stories. That said, AAA seems to consistently get the worst reviews in my reading of groups & forums.
Flip a coin and pick one. I went with Good Sam and has a great experience when I broke a leaf spring in a Walmart parking lot on a Sunday.
If you go with your insurance company, make sure they’ll tow both your tow vehicle and your trailer.
Link for a discount at Good Sam: