Good information above, generally speaking a tow dolly with brakes is much cheaper than flat towing. Some cars can be towed on a dolly and some cannot. Some cars can be flat towed and some cannot.
There are pros and cons to both and to trailer towing including an enclosed trailer. There is a trend towards reduced vehicles that can be flat towed. My 04 CRV AWD was a great flat tow car. In 2014 the transmission was changed to increase fuel mileage and can no longer be towed as just one example.
Make absolutely sure you have written mfg conformation that your vehicle can be flat towed.