wilheml kempff did some nice arrangments, too, of 'jesus, joy...' which i think is the easiest of the three.
'awake, the voice is sounding' bwv 645 - is my favorite to play with the voicing - but it is much more involved. i'd say the busoni will be 'connecting' voicing more. it's harder, but well worth learning. i thought i liked the busoni best until i found the kempff. both are really nice!
the siciliano from the flute sonata #2 is really nice, too! by kempff.
ps the book is entitled 'js bach - 10 pieces transcribed for piano by wilhelm kempff'