image from manufacturer

According to Rug Doctor customer service, the main difference between Rug Doctor Mighty Pro, Mighty Pro X3 and Wide Track carpet cleaning machines is the size, weight and capacity.

The Might Pro is the smallest one whereas the Wide Track is the largest one.
The approximate cleaning path of the Might Pro, X3, and Wide Track are 9.25 inches, 10 inches, and 11.25 inches.
The Mighty Pro weighs 36 lbs, the X3 weighs 39 lbs, whereas the Wide Track weighs about 44 lbs.

All of them have 2 tanks – a clean water tank for holding clean water or clean water mixing with cleaning detergent, and a recovery tank for collecting waste water. The clean water tank is smaller than recovery tank.
The clean water tank on Mighty Pro can hold 2.6 gallons versus 3.0 gallons on the X3, versus 3.7 gallons on the Wide Track.
The recover tank on Mighty Pro has a tank capacity of 3.1 gallons versus 3.9 gallons on the X3, versus 4.8 gallons on the Wide Track.
According to product specs, a full clean water tank of the Mighty Pro can cover 118 sq. ft. , X3 can cover 147 sq. ft. whereas the Wide Track has a full tank coverage of 159 sq. ft.

The Mighty Pro and Mighty Pro X3 use single solution pump and 2 jets, pump pressure is 28 psi.
The Wide Track features dual pump and 2 jets, pump pressure is 32 psi.

Mighty Pro has more metal parts than the Mighty Pro X3.

The last thing – price.
On rugdoctor.com, only the Mighty Pro X3 and Wide Track are available to purchase while I am writing this short article, the Mighty Pro X3 is priced at $459.99 whereas the Wide Track is about $300 more expensive, its list price is $749.94.

For a house that is larger than average size, you may want to consider the Wide Track. But if you have a small apartment then you won’t like it, this thing is bulky and heavy, not easy to move and get close to the edges, you’d better consider a smaller one.