Some vehicles cannot be towed on a tow dolly, such as most 4x4's like the Ford Explorer and must either be towed on a trailer or be towed 4 down like we do.
This like most, will get different opinions. The people that use a tow dolly will tell you they really don't have a problem at the CG, the ones that tow with a tow bar will say the dolly is a pain.
Guess it is just a matter of different opinions.
Oh BTW, we use the Blue Ox Aladdin tow bar, really easy to store or just hang on the back of the coach when at the CG. The toad tracks really nice.
Also, don't forget about the added weight of the tow dolly and two more tires to maintain/replace.
Whatever you decide will be right for you.