It's safer to steer your model onto the runway when landing with the rudder instead of the ailerons. Less apt to stall the slow and already close to a stall wing. The aileron deflection from steering will stall one side when/if it happens, and there's no room to recover.

It's also safer to steer your liftoff with the rudder for the same reason. The wing isn't up to full speed, and is working at high angle of attack and a downgoing aileron has a good chance of stalling that side.

Using the rudder to correct the direction of the plane doesn't do those things.