For me I'm going to go this way.
AIQ
IMDN
JP2
I'm still in the honeymoon phase of owning AIQ, but man, the shots are just plain fun.
Pros and cons for me of each
AIQ - The layout is genius. There's nothing else quite like it that I can think of. I'm a big Avengers and comic-book fan, so unlike many here, that's a big plus. The music is horrendous. I mean, some of the monotonous songs grate on my nerves and rob the joy of playing. Stern, you can do much better. The rules are deep though not easy to understand, but as time goes on, I'm picking up some of the strategies, and that's making it a lot more fun to play. I think many people give up on the game before they reach this level and get stuck just opening the portal and fighting for gems. If that's all you're doing, the game is going to get stale quickly.
IMDN - I personally have always enjoyed IMDNs early music, and the Eddy theme is a win for me. The shots flow nicely, though the outlanes are brutal. I did love how each mode was unique and never felt like chopping wood. I probably would have kept it, but I needed to sell a game due to moving, and it drew the shortest straw in my collection at the time. I may get one again in the future.
JP2 - The theme does nothing for me. I can't stand the playfield art with Newman's big open mouth, and the toddler toys turned me off. However, the game shoots great, and the rules are fun. It's just not enough to get me past the downsides.