Hi Rachel!
Thanks for your question and for visiting the Disney Parks Moms Panel!
Oh boy, this is like asking a Panelist to pick their favorite child!!
Personally, I am a HUGE fan of
IllumiNations at
Epcot! The music is awesome and the fireworks are mesmerizing! And since it is being re-themed later this year, it will not be around very much longer.
That said, I also LOVE
Fantasmic! at
Disney's Hollywood Studios. This nighttime spectacular also has great music and LOTS of Disney characters, unlike IllumiNations, so that may play a role in your decision.
I really don't think you can go wrong with either show, but if I were escorting your group, I would bring you to IllumiNations!
I hope this helps and I wish you a Magical trip!!
Chris