Artaher,
I think the easiest is to sum it all up by saying that in my opinion the Yamaha is not at all intuitive, and the Technics is.
I have been using keyboards for 20 years, computers longer then that, and I find it very difficult to program and use the Yam. and to get out of it what I want. The OS is just not compatible with my background in the many Technics and NON ARRANGER keyboards I have had and used through the years. I have had this 9000 now for 9 months and although I can play it fine, I have only recorded one song to date and have not yet edited that song. I have added 65 mgs of sample ram and have yet to use the sampler. IN 3 WORDS: THE MANUAL SUX!
I have not tried a Tyros yet, and only recently heard of the two keyboards you mention so I am not familiar with them.
The kn series boards, you turn them on, play them, record them, edit them, tweak them, all very intuitive. That is my opinion for whatever it is worth to you.
I do admonish you not to buy a keyboard based on what someone else may think about them. Do your homework, research, try them out several times, compare them and ask for in writing an agreement to return the keyboard if it does not work for you.
Best to you
Bebop