Pace
Not flying today so can't give you an experiential answer.
I would say you will have yaw in both cases but in opposite directions. Back pressure will be needed in both cases eventually. L says that at slow speed the yaw in the case of banking only with the aerilon can be so severe as to cause the plane to turn in the opposite direction. Has anyone been able to verify that?
Obviously a coordinated turn is needed with both rudder and aerilon. But once the turn is established it's a different scenario. If one neutralises the aerilons at this point does it not make sense to neutralise the rudder too?
I'm not trying to be argumentative (although I like starting a lively discussion). It came as a sort of eureka moment as it explained a number of things I'd noticed while flying. Like why is the ball not where I expect it to be when turning? Why are my 45 degree steep turns suddenly becoming 60 degrees and more? Why am I loosing height? Why I am finding it so difficult to keep the plane level in a steep turn? Why do I need so much back pressure?