Owned IM pro- traded it back to original owner for GZ LE (and my GZ premium on order). Regretted that. Sort of.
Bought a late run JP premium. Why? Because I discovered the code depth in getting to Visitor Center- so many other mini games within the game. Great shots. No regrets.
IM premium came up for sale locally- bought that. I personally like the premium better, but the Pro is a damn fine game. Not an IM music fan, but very happy to have this back in my collection.
I am very lucky to have a good size collection- also have LOTR, AIQ, and many others.
If you want longevity and a deep code game- JP hands down.
If you want a 4 flipper game with very cool shots, great code, great art, and IM music- IM hands down.
I am 63 and an above average player (not great, but have made it to Visitor Center on standard settings).
Good luck!