While I could flat tow our C-Max I still went with a Acme dolly. Most Ford hybrids can be flat towed but
there are some issues that can be "gotcha's" that aren't covered very well in any of the guides. A visit to a forum for your TOAD may be helpful in finding any of those issues.
As for which is easier I suspect flat towing would be quicker in almost all cases. But then I can tow just about any front wheel drive vehicle with my dolly with minimal adjustments and no
added expenses. Both methods have their advantages. See Here
for some previous discussions on flat versus dolly....
By the way if you go with a dolly I suggest having a hitch added to your TOAD if it doesn't already have one installed. I had one added to my C-Max and that allows me to use it to move the dolly around very easily.