Spotbot Pet vs Portable Spot Cleaner
images from manufacturer

These 2 portable machines are designed for cleaning spots and stains on carpets, stairs, upholstery, autos, etc. But there are some big differences between them.

Design
The Rug Doctor Portable Spot Cleaner has a hand tool that equipped with an oscillating motorized brush for spot
removal. While the Bissell Spotbot/Spotbot Pet(same machine) not only comes with a hand tool but also features Spiral Brushing on the bottom of the machine. With the spiral brush, you can remove stains handsfree. You just set the clean cycle, leave it on a spot and it would do the work for you.
However, the hand attachment on the Rug Doctor is larger and has better suction.

The Rug Doctor has Carpet-Friendly Wheels and a Telescoping Handle that make it convenient to move around the house or clean the stairs. While the Bissell has no wheels and only a carrying handle.

Motor Amperage
It is 10 amps on the Rug Doctor versus 3 amps on the Bissell.

Tank
Both of them has a clean water tank and a collecting tank, however, the Rug Doctor Portable Spot Cleaner has larger tanks.

Warranty
The Rug Doctor carries 2 year limited warranty whereas the Bissell is backed by 1 year limited warranty.

Weight
The Bissell Spotbot is ligther.

Suction
According to user reviews, the Rug Doctor has stronger suction. While using the Bissell handsfree mode, it can leaves too much liquid.

Clean Up
It is easier to clean the inside of the dirty water tank on the Rug Doctor.

Overall, if you want to use the a small machine for your upholstery, furniture, autos, you can buy the Rug Doctor. If you are looking for a portable machine for cleaning dog and cat accident stains and smells on carpets, then you can try the Spotbot/Spotbot Pet.

P.S.
Both of them do not have a built-in water heater, you use hot tap water.

If you have anything else to share on these 2 spot and stains remover, please comment below.