ONe thing needs to be known. None of the ERS services own any equipment. You will be calling a call center which may work for more than one company.
The tows are sub contracted out to towing company's. So the relationship between the Emergency Road Service, their call centers and towing sub contractors is what is important. How much they pay their call center emplyee's, how much do they pay tow company's and how quickly do they pay the bill are all important.
When calling ERS just about guarantees you will be towed, not always a good thing in my opinion. Took me 2 days to get a mobile mechanic in Chagrin falls Ohio.
I have the ERS ryder on my State Farm policy and also use Coach Net. Every year before I renew I do my due diligence and every year Coach Net is #1.
So there I sit with the State Farm ryder, the #1 ERS Coach Net, in Hells Canyon SD on a Friday night, with no cell phone signal and not a car in sight : )