Husqvarna 580BFS Mark III vs 580BTS Mark III - The differences

There is pretty much no difference between the Husqvarna 580BTS Mark III and the Husqvarna 580BFS Mark III. The main difference is that the 580BTS Mark III has a tube throttle, while the 580BFS Mark III has a hip throttle. Whether the hip-mount or the tube-mount is better is a matter of personal preference.