These "tests" appear to be done by someone without a lot of knowledge about either instrument, and who may or may not be biased towards one or the other.
Then, you have key feel, which, although subjective (and personal), is pretty darn important, and in this scenario, keyboard length, also a significant factor.
I believe the Roland will appeal to an entirely different type of player than someone choosing an S950...certainly someone concerned with the extra keyboard acreage, and not concerned about having on-board speakers just to name a few pertinent features.
The people behind these videos aren't doing either product any favors.
Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.