We use CoQ10 as ubiquinone. Ubiquinol is a LOT more expensive but in our opinion not worth the extra cost. Essentially world supply of ubiquinol is controlled by one company. The only research that shows that ubiquinol is superior to ubiquinone was sponsored by that same company so it's not exactly independent.
Regardless of what form of CoQ10 you take as a supplement, the body is able to convert the consumed form to the other form as needed. In other words, if you take a reduced CoQ10 supplement (ubiquinol), the body can convert the reduced CoQ10 (ubiquinol) to the oxidised CoQ10 (ubiquinone) and vice versa. This conversion takes place to maintain a state of equilibrium between reduced CoQ10 (ubiquinol) and oxidised CoQ10 (ubiquinone).
Unquestionably, both forms—ubiquinone and ubiquinol—are effective and essential to important pathways in the body, and in states of need, either form can be reduced or oxidised to form the other.