The disk will roll higher up the incline. The sphere will roll higher up the incline. Both roll the same height up the incline. They don't reach the same height, but you can't predict which one gets higher. A child stands at the center of a circular platform that is initially motionless, but free to rotate frictionlessly about its center axis.
Someone gives the platform a push, and it begins to spin clockwise.
If the child steps toward the edge, the platform will speed up. If the child steps toward the edge, the platform will slow down. If the child steps toward the edge, the platform will not change speed at all. If the child steps toward the edge, the platform will stop, and begin to rotate counterclockwise. A student sits at rest on a lab stool that is free to rotate.