You guys may find this weird coming from a manufacturer, but when it comes down to it, its all about who burns the most fuel. Any of the airframes mentioned above will get the job done. The question becomes, are you willing to put in the time and effort to get the aircraft properly set-up and trimmed? Are you willing to put in the time to master your sequence as well as working on various combinations of rolls, snaps, rollers, etc. that you may encounter in the unknowns? The airplane will not do this for you.

I remember a few years back in the SE district, a fellow from Florida was competing in Unlimited with an old, heavy Lanier 1/3rd scale Laser, against everyone else who had the latest greatest. He was well practiced and prepared and kicked some butt. Time spent behind the sticks is what really counts.