Much easier to tow with bar, only if the vehicle can be towed all four on the ground. Nowdays there are fewer and fewer that can be flat towed due to transmission and in some cases the final drive in transverse engines.
Also the weight of the dolly adds to the total towed weight, reduces the vehicle weight allowance you want to tow.
Which is best depends entirely on your situation and preferences.
We tow a 2002 PT Cruiser in a dolly because we did not want to sink a bunch of money into an old car and did not want to replace it yet. We got a used dolly with surge brakes so our entry costs were minimized.
If you want to keep your current car (assuming front wheel drive) and want flexibikity for future cars, then the dolly may be for you.
Towing 4 down requires more initial set up but is essier to hook up and stow. I think the initial cost would be about the same as a new dolly. Loading and unloading the dolly is not too bad unless it is raining or the dolly and car are caked with mud like ours is right now after towing 1800 miles.
Either way, it is great to have an escape pod. When we replace the Cruiser we will likely get a CRV since they are easy to tow and about the same size.
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