I've owned both and sold JD, Still own JM and prefer JM by a sizeable margin. JD has the better theme and artwork but JM has far more enjoyable rules and better gameplay.

JD is still a good game and I kinda miss it but the rule-set just never clicked with me. I'm not a fan of Supergame at all so I rarely played it and the Wizard mode is really disappointing. I also think that the "Crime Scene" aspect of the rule-set could have been implemented better into the rules. I mostly ignore them and just just take the awards that are given (extra ball, etc.) The modes aren't bad but I could do without a few of them (Manhunt, Bad Impersonator). I usually find myself just trying to start multiball and cheat to the wizard mode that way vs. slogging through all of the modes. The game does flow really well for a widebody but does not feel as tight or fast as JM. The left ramp is far too easy to repeat. Still a great bang for the buck machine but not among my favorites

JM on the other hand just "clicks" with me. I love the wizard mode and the rule-set. Besides the spinner millions exploit I think they are pretty much perfect. There's only a handful of modes yet the wizard mode is still pretty difficult to get to if your game is setup hard and fast. I also like that you need to do well and collect "Gigabytes" to reach Powerdown. I actually like the grid and the strategy behind some of the choices. The video mode is also a favorite of mine as it is difficult to master yet offers some great payouts. I also like that your grid choices affect which shots are jackpots in Multiball. Yakuza is also very rewarding as are most of the throwing stars awards. My favorite thing is just how well the game flows and how fast it is! When you get on a roll the game just sings and those orbit shots are fast! gameplay/layout wise it is one of my favorite games of all time. If it were themed as "The Matrix" I think it would be a top 5 game for me. Not only is it my favorite game that typically sells for $2000 or less but I think it may be my favorite $3500 and less game. I'd put it in the same tier for me as games like Shadow, BSD and Congo and I think I may like it the best of that group which is saying a lot.