Two somewhat different boards.
Magic has much more rocker and way deeper sidecut => great in powder and super turn happy. Far from the best for groomer bombing and all out charging.
GNU Impossible is the equivalent to the Attack Banana in shape => a bit more stability and charging inclined (but not too much considering the EC2 profile).
To be honest, I always thought the AB was a bit of a strange animal - too stiff to be really playful, but not a real charging board either. Not bad in the trees, though.
Love the Magic, but thought it was a deck for pretty specific application - in the end did not use it enough and gave it away.