These two are different. A belt sander is an aggressive tool to remove a lot of material in a quick time. But the orbital sander is not for any dynamic work. A belt sander is massive, but the orbital sander is lightweight. Both of them are easy to control. In the case of a belt sander, two rotating drums turn, the sanding belt moves. On the other hand, an orbital sander works by moving the sanding paper in a small circle. So, if you need a super-powerful sander for large pieces of wood, go for the belt sander. Otherwise, for small pieces of wood, go for the orbital sander.