What two motors tell you about the controls
Use the written control instructions when you want to adjust each motor separately.
Find the statement about independent operation
The Aura Ripple and Flutter descriptions explicitly identify separate operation. Wavy also has two motors, but the listing says they are controlled together. Look for the equivalent wording or a manual for any other model.
Read what the extra button does
Romantic Rabbit has a hold-to-boost button. Check the instructions to see which settings it affects. A single extra control may be dedicated to a boost or travel lock.