If you have young kids, I would say the wishes cruise would the one to go for.
I have done both. The Illuninations Cruise is Beautiful, but I liked the Magic Fireworks Cruise better through grand gatherings.
It can be more expensive though depending on the size of your family. See for a family of 4 (2 families went together as we were linked to make the group 8) was $89.50 ($29.50 - adult and $15 child).
If you got a pontoon boat it would be $120 for I believe up to 12 people.