You do need to see both of them. They're both spectacular. My DW and I both love them.
And we don't even have any little kids anymore as an excuse!
I wish they hadn't gotten rid of the "Hunchback of Notre Dame" show. We went to see that a number of years ago and ended up sitting right next to the runway halfway out in the audience. It just happened to be the spot where Clopin sings the final reprise of the "The Bells of Notre Dame". That kid was unbelievable! I still get chills just thinking about it!
Tom (... loves stage shows!)