Both expansion screws and plugs are a way of securing objects to walls or other base materials. An expansion screw is a torque strength screw that holds an item in place by drilling a hole into the material and screwing the screw into the hole. An expansion bolt is a variant of an expansion screw, usually made of plastic or metal, that is extended in diameter by inserting it into a borehole and tightening the nut so that it creates friction with the wall of the hole to hold the item in place.

The choice of expansion screws or plugs depends on the weight of the item to be fixed and the material of the wall. In general, expansion screws are suitable for lightweight stationary items such as photo frames and small fixtures, while expansion plugs are suitable for heavier items such as bookshelves and cabinets.

In addition, the expansion pins are more reliable because they form friction with the hole wall and are better able to resist horizontal and vertical forces, while expansion screws may loosen in the face of vertical tension.

To sum up, an expansion bolt is usually better than an expansion screw, especially if a heavy object needs to be fixed or a more reliable fixation is required. However, when selecting an expansion bolt or expansion screw, you should also consider the weight of the wall material and fixed items.