Just from the first comparison, if the player couldn't be bothered to balance the RH against the jazz style, so each was about the same volume, it's no comparison. He swamps the Roland with the lead sound.
Then, if you are going to compare Hammond's, use the same dang registration! And a swell pedal. That BK-9 setting had the amp simulator set to break up at full volume, which, because he wasn't using a swell pedal (doh! how can you play an organ without one?!), it was distorted ALL the time.
Same issue with the blues demo. Can he not HEAR just how loud the Roland's RH sounds were?! All it would have taken was him to back down the 'Balance' knob towards the style (BTW, that's what I generally do on ALL the factory setups - God knows why they are so RH heavy!).
Nice of him to use the bender on the Yamaha 60's guitar, but not bother on the Roland
(and his touch was a bit heavy for those sounds).
Pads and choirs, just picking adjacent Tones when there's almost 100 or so to choose from, not so great. But one thing you notice right away... You always get a glitch in the sound when you change patches on the Yamaha, most of the pad changes on the Roland morphed smoothly from one pad to the next, which is nice if you are building complex sounds.
Maybe this guy is simply showing what you get if you pull these from the box and play without even TRYING to adjust anything, even the style/keyboard balance.
Or maybe he gets a better commission from the Yamaha sale! Who knows..? But I'm afraid that one simple adjustment would have shown the Roland in a better light.
Both sound great, mind you... Once again, only the player can mess things up!