I would only consider Dolly towing as a temporary option. If you have a need to tow different vehicles on a regular basis, it is a viable option. Most, including us, find it much more convenient/expedient to flat tow.
We sold the motor home several years ago and we've recently re-entered the RV market with a travel trailer. But when we had our motor homes, we researched both and decided the convenience of flat towing was definitely our preference.
Research equipment options to understand the pros and cons of each brand and type of tow bar set up.