If you’re torn between needing an oscillating multi-tool and a rotary sander decide how much work you need to do with it. A rotary sander will cover a larger area and is more powerful than most multi-tools. This will allow you more power and usually a variable speed. These sanders work on the same principle of an oscillating tool where the head moves back and forth at high speed to create a smooth finish much the same as you would through hand sanding, only much quicker. A 5” tool is more than enough for most home use and will work on sanding wood and metal projects. The nicer ones also have dust bags so help make clean-up easier.

Features & Applications

Sander is available in a range of types depending on your sanding exercises. To summarize, if you plan to sand on rough surfaces, or repairing poorly done saw cuttings, or giving joints a neater look, then belt sanders would be the convenient choice.
FYI, buffing and polishing is a no-brainer for Sanders, and getting into detailed sanding will require a detail sander or palm sander. To remove old coatings and surface wood from work pieces, random-orbit or orbital sander is brought to use.
Among other sanders, you will find the drum sander and belt-disc sander. These two are more of large-scale and robust sanders.