Let me preface this post by saying that I think all of the music for the shows is awesome. Some people collect pins, some collect napkins (remember that thread), others collect figures, etc. I collect Disney Music. I have over 30 hours of it. With that said....
I love Fantasmic. I have it as the ring tone on my cell phone.
If you would have asked me this question 3 months ago, my answer would have come quickly and I would have been sure about it: #1: Fantasmic, #2: Wishes, #3: RoE. I really hadn't liked Illuminations since they changed it. We used to see Illuminations every night and when we arrived in 2000 we were very disappointed to see that the old show was dead. It left a sour taste in my mouth.
Over the last few months, I've been listening to the RoE and its been growing on me more and more. I really want the first dance at my wedding to be to 'Promise', and the rest of the music is good too.
My list now is a lot tougher to come up with. I think I would rank them all equal because they all stand out to me for their different reasons. Fantasmic because the tune is so catchy and the spirit of the show is the heart of Disney. Wishes because it has the classic Disney tunes, and RoE for its originality.