Obviously, there is no answer to this. Because you need to determine your actual situation to make a choice. Regarding RV electrical systems, if your RV is small, such as Class B, Toy Hauler, Pop-up, etc. With limited space in the car and limited use of electrical appliances, a 12V system may be more suitable. However, for a large RV such as Class A and 5th Wheel, a higher voltage 24V or even 36V, 48V system will be more suitable, because the car space is large, the number of electrical appliances that can be accommodated, and the wiring cost can be effectively reduced.