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An orbital sander is particularly effective for finishing a surface because it uses a circular sanding pad that moves in an orbital pattern, allowing it to smooth surfaces evenly without leaving noticeable swirl marks. This makes it ideal for achieving a fine finish on wood, which is often required after rough sanding has been completed.

The design of the orbital sander helps to minimize the risk of creating gouges or uneven spots, which is crucial when preparing a surface for painting or varnishing. Its versatility allows it to be used on various materials, including softwoods and hardwoods, making it a favorite among woodworkers and finish carpenters for tasks that require a polished look.

In contrast, the other tools mentioned have different purposes. For instance, an angle grinder is primarily used for cutting and grinding materials but does not provide the same finish quality as an orbital sander. A rotary tool is great for intricate tasks, like carving or engraving, but it may not offer the smooth surface finish necessary for larger areas. A belt sander is more suited for heavy material removal and can leave marks that might require additional finishing work, making it less desirable for the final smooth surface.