RE: What is the difference....
You see a lot of Road Runners at your field, because the Road Runners were manufactures in Lander WY. I have never seen one on this end of the country. But, I have seen thousands of Sticks. The Road Runner was a Stick. The basic Stick design can be traced back to Phil Kraft's "Das Ugly Stick" which was published in the May/June issue of Radio Control and Model Aircraft World in 1966.
Doug