While the canards typicaly are designed to stall before the wing, it's common knowledge that you can always figure out a way to screw up the airflow over a wing...the big advantage seems to be having non opposing lifting forces...all lifting forces on canard plane are typicaly going up..this leads to less power needed, less drag, better range for given speed and horsepower...throw the props on the back aircraft, like the Starship, Piaggio, EZs, then you don't have a disruption of thrust flow over wings...all adds up to more performance efficiency.