Neither. Inertia is not a force.
Inertia is the force that allows objects to keep doing what they are already doing. It is the tendency of objects to resist changes in their motion.
Force is a push or pull acting on an object, causing it to move or change its state of motion. Inertia is an object's resistance to changes in its state of motion, meaning it will remain at rest or continue moving at a constant velocity unless acted upon by an external force. In other words, force is the action that causes motion, while inertia is the property of an object that resists changes in its motion.
Inertia is the tendency of an object to resist changes in its motion, while force is a push or pull that can cause an object to accelerate or decelerate. Inertia determines how much force is needed to change an object's motion - the greater the inertia, the greater the force required to change its motion.
Force can be either a push or a pull. When you push a door open or pull a rope, you are applying a force in that direction.
A force can be either a push or a pull.