More advanced in regards to chassis? I think the 570 has the more advanced motor. Did they feel similar in throttle response?
I prefer the sound of the 570 and the trottle responce isn't a world apart. The 570 is maybe a little snapier but nothing to write home about.
The 550 motor sounds like a diesel engine (sounds like there is a handfull of quaters loose in the top end, rattles), the 570 is nicer.
EPS is the same.
Yes the 550 is more refined, better ergos, suspention, frame
, ebs. steering is a bit more precise. Racks are better on the 570 but the whole atv looks cheap compared to the xp. I don't know if the 14 in weels make a different in handling but the atv takes curves and sharp turns better.