1. CMI/MI2 I can't really choose between these two. They are both funny, great fun to play and have great sound.
2.SMI I found this game still pretty fun. It isn't nearly as funny are or as Varied (only 3 different places in entire game) as MI2/CMI.
3.EMI Wasn't a fan of the graphics, wasn't as funny, not nearly as fun and I didn't really like the story.