ironjive, you do not need both!! In my opinion, you'd be wasting your money paying for a Coach-Net policy. The Ford Roadside Assistance gives you a 24 hour seven-days-a-week Hotline that covers the following (from their brochure):
Flat Tire Changes (No Charge with Ford)
Jump Start For A Dead Battery (No Charge with Ford)
Gasoline, If Out of Fuel (No Charge with Ford)
Vehicle Lock-Out Service (No Charge with Ford)
Towing To The Closest Dealer (No Charge with Ford)
When that expires in five years (or 60,000 miles if that is first), you can then consider Coach-Net for roadside assistance ...or any other you prefer.
As kalynzoo has said, there shouldn't be much of a difference in how road calls are dispatched as they use many of the same providers when you have an actual breakdown. The type of service you receive will depend more on who the provider is that comes out to help you and not necessarily that of the call center who dispatched them (Coach-Net, Good Sam, Allstate, AARP, etc. ...and even they sometimes will use the same call centers, Good Sam using Allstate call centers, etc.).