I've never owned a two wheel tractor, having looked at BCS and Gravely over the years, I agree that the main benefit of a 2-wheel would be maneuverability. Am now on my second Wheel Horse garden tractor, having owned each for 20 years. Am sorta looking about for a new machine but very unfortunate that TORO has discontinued manufacturer of Wheel Horse.:
At this point the Wheel Horse still runs well and mows well. But that's not going to last forever. Got a nice buy on a Sears used rear tiller a few years ago for the gardens.