Cannard is as eficient as any "conventional" tail... maneuvrability depends a lot of static margin (distance between CoG and Center of pressure) and how big your control surfaces are. Just analyse the "free body diagram" af a plane to get it...
I'd rather make a comparison between Rafale/Eurofigther against Su-27 / Mig-29; those russians are most maneuvrable than others (and I'm not pointing to the canard+trhust-vector-control ones).