Guy , you have to remember that any form of Roadside assistance cover is Insurance.
But unlike Car insurance you dont have to have it , you have to personally decide it its worth the cost based on what you think you may use it for and what it will provide you.
Like any insurance its expensive till you have to make a claim.
I work in the recovery inductry and cheap is not neccessarily good , nor is expensive.
Consider this , Greenflag dont have any employed roadside staff they are all contractors. I wont bore you the facts but a significant number of such independant contracts are going bust every week. Greenflag no doubt have a relentless task of ensuring they have sufficient contractor coverage across the country in thetough economic times.
RAC and AA have employed Patrols and the backing of huge parent companys , AA being owned by Saga and RAC by Aviva - the worlds 5th largest Insurance provider. So you can see whilst AA and RAC may be a bit more expensive , their not likely to go under any time soon and will pretty much be able to service their customers with one of there patrols across most of the UK.
With other providers your may be at risk of them not being able to provide a service or that service taking unacceptable time to arrive , you have to make that call.
I'll stick with the No1 provider knowing they have a good product , have been voted by paying customers the No1 for the last 3 years , and , have massive resource and backing in their parent company.