Diki, Perhaps your question would be better answered on the 'technics' page by players who have 'gotten into' their kbs more than I have, but...
I have only owned 2 kbs - technics kn1000 and kn6000 ... I really have not played any others so I cannot comment on them, but as far as technics is concerned, I can only say that it is extremely user friendly, especially for finding/changing styles and voices ... many of the features that some other kb owners have wished for (based on conversations on S-Z) I have on the kn6000 ... I can change voices/volumes/pans/effects/etc. in a midi file 'on the fly' while playing that file, ... I can easily 'edit' an SMF while it resides in the kb and save my changes ... the kn6000 has a hard drive where I save SMFs registrations, etc. which can be 'edited' and saved with ease ... each style has 2 Intros and 2 endings and 4 variations at the pressing of a button ... I can 'Easy Record' a song, or parts of a song, and then through 'Realtime Recording' add other tracks as desired ... I can easily edit single notes in a song ... and on and on ... One feature the technics does not have, which I wish it did, is the ability to 'mark' an SMF to return to the beginning, or the bridge of the song ...
I'm not saying technics is better than any of the others, but mine has served me well, and hopefully will continue to do so ...And it's a damned shame Matsu***** stopped manufacturing this board ...
Hope this helps ...
t.