This is a time saving tip.
Always prioritize stunts that unlock vehicles in your supply drop. Hover over the various stunts and it will display if the reward is a supply drop. There is always a vehicle nearby to complete those stunts. Use your AirScan to locate it by pushing down on the left thumb stick and aiming at them. Some are closer to the stunt ring than others.
The reason for doing those stunts first is that some stunts require certain vehicles and sometimes those vehicles are hard to locate. If you unlock them you can always call in a drop with the specific vehicle needed to complete the stunt.