I have JD in a current 3 game collection and it's great. I've played both FT and JD, but own JD. For me, there's just a lot going on and a lot to do in the JD and I never really get tired of it.
I think the music in JD is awesome, there are 4 flippers to use which is great and keeps things interesting, the ramps are well used, plus there's 2 separate habitrails and a subway from the center shot behind the JUDGE drop targets. I think the modes are diverse with clear understanding of what do do/hit, and with the MB you get to battle 4 different demon Lord's, which is cool. Not to mention there's the option of playing "super game" from the start, if you want. There's humor in both games, but JD is the winner for me.