Wow I forgot all about the Juju, can't comment on the disciple. The whole idea with the Juju back in the day was it spun way easier. The juju was the "magic spin board" (as K2 called it) I rode a friends, god this had to be..I dont know..ten years ago.. and it spun MAYBE a little better but as a beginner it wouldn't really matter.
Do these come with the boots? Are they the right size for you? There's more factors here than the board.