I've been using the Sabertooth 2x12(amp) dual motor controller in my smaller Stahl tracked models for yrs & have a 2x25(amp) in the JD850. The best feature of it is one ch operates forward/reverse & a different ch to steer, that's what I miss now with my latest track hoe being the Fumotec JD450, it has brushless motors in it & the Sabertooth cannot be used. Making the 450 move around, especially on a delicate slope becomes a little more complicated having to operate two chs now with two sticks as well, if the boom is assisting in the move.
https://www.dimensionengineering.com...bertooth2x12rc
And whatever esc for the swing, preferably something that either has or can be programmed with a "soft" brake & smooth acceleration.