You may consider me biased. Given the available power options for each airframe, I will say the Q500 will always be faster than the Patriot and the F20. The Q500 is just so much lighter and has less drag.

That being said however, perhaps the Magnum would be faster than a Q500 in straight-line speed. I don't know, I've never seen a Magnum fly in person.

Also, you must remember that there are different flavors of Q500s. A Vortex, Shotgun, Bird of Prey, or Neme-Q will be faster than a Predator or Viper. The quality of those ARFs (predator & viper) are nowhere near the custom built jobs. You get what you pay for.