Out of the choices you have, Illuminations. Epcot is my favorite park and watching Illuminations and then walking home to BC is a perfect night to end a day in WDW.
Wishes does nothing for me because my favorite fireworks show is Remember from DL. I also like Fantasmic! at DL much more. I have also seen the MSEP many, many times as a local here in LA.
Illuminations: Reflections of Earth. It's the easy winner for me, though I do appreciate the others. Plus, I absolutely love the holiday tag added to Illuminations... nothing can really touch that for me.
Wishes- starlight,starbright, the first star I see tonight, I wish I may, I wish I might...
There is nothing like standing in the middle of Main Street USA, looking up at the castle and hearing that song, along with lots of other classic Disney moments and seeing the fireworks go off. Amazing.