We have been very happy with AAA Plus. Have been with them for almost 20 years. Have had the RV ryder for 10 years. Have used them twice to tow our tow vehicle and trailer (the HTT in my signature).
AAA plans differ by region. Our region covers off-road extraction as long as the driver is comfortable with getting to where the vehicle is stuck. I would expect, if an RV can get there so can a tow truck.
For us, there is no comparison. We had Coachnet and AAA Plus at the same time (Coachnet came free for 1 year when we bought our HTT). We had a breakdown almost 100 miles away from our destination. Coachnet offered to tow us to the nearest campground and get us set up, then take the tow vehicle to the nearest Chevy dealer. AAA had no problem towing us to our destination and then taking the tow vehicle to the dealer for repairs. Coachnet would not let us pay the difference to go where I wanted. The kicker to this story is that Coachnet and AAA both called the same tow service (the only guy in the area that could accommodate 4 of us, the HTT and the tow vehicle). I should also mention, both times that we needed to use the RV portion of AAA, we were outside our home region.
Never bothered with Coachnet again. We got a free year of Coachnet service when we bought our Motorhome a few years later, but never bothered to sign up.
That being said, in your region AAA Plus might not be worth it. You should call both and find out which service better suits your needs. As others have said, check with your insurance company. You may already be paying for Roadside Assistance or may get a better deal through them.
-Michael