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Confidence votes 317. Inertia is rotary momentum; an object's ability to continue spinning when a decelerating force is applied. Just as a heavy object takes more effort to stop from the same speed as a light object, so does a heavy object take more effort to stop from turning at the same speed as a light object. So assuming they are turning at the same angular velocity, the heavier one has a larger inertia.
The definition of inertia is when an object remains still or moves in a constant direction at a constant speed. Inertia will continue unless the object meets some external force. The more inertia an object has, the less the object will change its motion when it meets another force. The ground is the force, the motion, that causes the object to no longer have inertia and to instead stray from its speed and direction.