Once upon a time, Caterpillar's large tracked AG tractors were built by CAT. They were Challenger (brand) . Perkins Diesel was owned by Massey Ferguson (Division of AGCO) Caterpillar had a very successful line of BIG diesels, but hadn't done all that well in the small diesel market. They wanted Perkins. Massey Ferguson (AGCO) agreed to sell Perkins to CAT. In return, CAT agreed to sell a line of small to mid sized AG, utiliity, and compact tractors that were essentially rebadged Massey Fergusons. Thinking is, this allows MF/AGCO to produce and/or have produced a much larger volume of tractors, hence economy of scale lower production cost (per unit) The move also gave AGCO/MF a large infusion of much needed cash. The move has helped CAT AND MF/AGCO from all indication.
With Challenger, you'd have the great warranty service/parts service that is Caterpillar. Down side is the cost of that service !
Challenger tractors are becoming very popular in commercial/industrial applications, primarily because of the CAT field service capabilities.