Frankieve
I can't help you with the comparison and there is an error in the Specs. The XP unit has 128 factory styles and 128 user styles. It comes with 256 styles. I'm just a hobbiest so I can't be of much value for comparison. I had the Genesys and liked it a lot but ran out of room and it had to go.
I bought the XP which is hooked up to my Technics FA-1 organ and it sounds way better then the original Genesys and I was very happy with it. Being able to split the lower keyboard has effectivly given me a 3 manual organ.

The XP is very solidly built and comes with a padded custom carrying case which is actually pretty impressive.

I beleive you can download the XP manual which might give you some more insight.

Jerry