Except for the larger display they are almost identical for the most part,..S970 audio styles sound a bit more refined then previous on the S950. A few mega gutars are more active within some styles.... But aside from that not a big difference at all. Hoping to see what becomes available from Yamaha next release with
TYROS 6 (?) or S series units in the future. Like I said at this point sound isn't an issue anymore IMO they all for the most part sound really good it's all about the navigational features, and design, weight, keybed, tilt display/size, inputs/outputs positioning, knobs & sliders, VH,.