I'd say it's close to 50/50.
DI is a packed Lawlor pin. His designs are slow flow, like the popular 90s pins. The game is fun with unmatched multimedia. The modes are great, and the theatre is very cool. It is also less multiball heavy, which matches nicely with 90s style. But the scoring is slightly unbalanced, and the Bob modes and theatre modes are sadly secondary. You also have to remove the protectors and use Mylar instead to avoid the supposed design flaws. The game could be the goat, but they refuse to update the code. Even with these flaws, the game is crazy good. That's how good it is.
JP is like all Elwin pins: it is designed for trap and shoot. If you want to learn to play next-level pinball, his designs are out of this world. You'll get deeper, more balanced rules. It has linear and nonlinear linear progression paired with difficult but crazy satisfying combos. On the down side, the game is more difficult to learn and play, and you have to like controlled gameplay. Plus you have stern cheapness in components (speakers, coil stops, knocker, power source/switch etc). They have gotten better in other areas, but stern cuts corners wherever they can.
If jjp would fix the code on DI, it would be an easy pick!