Tabletop vacuum ovens are relatively small and require a lab benchtop. They need to be placed on a table. Another drawback is that the vacuum pump is externally connected, which can be less aesthetically pleasing. However, for added aesthetics, you can also connect a lower box to conceal the vacuum pump. See the image below, which shows a tabletop vacuum oven.
Vertical vacuum ovens have a concealed vacuum pump, giving them a more sophisticated appearance. Furthermore, they eliminate the need for a tabletop and can be placed directly on the floor. The image below shows a vertical vacuum oven.
There's no difference in usage between tabletop and vertical vacuum ovens. Purchasing depends on your company's needs and application scenarios.