Always been 61 for me... Although Nord's idea of 73 is interesting..
Its not Nord's idea..
There is a Kronos 73 to
But i beleive this idea was all started with sequential instruments Prophet T8
what Nord does, by adding the pitch stick and wheel above the key and not to the side however makes a difference in size. And due to its position it feels actually very very natural..
Nord stage 3 compact with an SD40 Donny? its a perfect thing..
The big advantage of 76 and espescially 88 keys is having room for more then 2 parts (left right) on the keybed..
On my Kronos i prefer 4 parts when controlling an arranger
-Bas to the far left
-left hand chords..
-right hand voices(main)
-2nd voice (top right) for solo's
That just doesn't fit on a 61 key, probably not even on a 76 key