With out a doubt the 9070sts is a better machine, they have done a lot of work in the back moved batteries etc made a whole lot more space. The machine seems doesn't make a thumping noise when the crop gets a bit damp. The cab is comand center is lot better, powerfull diagnostics, mapping is better,( pity they kept the moisture sensor though). The feeder house is improved, hopefuly the front lower bolts don't break as much,and the high torque reverser box will also help. Also seems the older 60s have heaps of electronic issues, seem to go through a fair amount of circuit boards.