Both are equally great sanders but the biggest difference between them is the sanding surface. The Makita 9903 weighs about 4.3 kg and has a sanding surface of 533 x 73 mm. The Makita 9920 weighs 4.5 kg and has a belt surface of 610 x 76 mm.
Do you want to compare all Makita belt sanders on the market today? Read: Compare all Makita belt sanders
Makita 9903 3″ x 21″ Belt Sander
The 9903 features a powerful 8.8 AMP motor with electronic speed control to maintain constant speed under load.
The variable speed control dial allows the user to match the speed (690-1,440 ft./min.) to the application.
The 9903 also features less noise: at only 84dB, it is one of the quietest sanders in its class.
Makita 9920 3″ x 24″ Belt Sander
The 9920 features a powerful 8.8 AMP motor that maintains constant speed under load, and variable speed control to match the speed of the application.
The 9920 also features less noise and vibration than competitive models, which makes it an excellent choice for any contractor.
For more details on this sander, you can read our Makita 9920 review.
Design and grip
The design of the belt tracking system and the grip make this sander extremely easy to use. The low profile design and extended base allow you to sand flush against walls, making it a versatile tool.
Why should you buy this tool?
The Makita 9920 is a sander that is designed for woodworkers who need to undertake jobs that require precision. This product is perfect for a variety of jobs, such as cabinetry, furniture making, and more.