I would personally vote the dessert party. You get a great view of the show plus a guaranteed seat. And you don’t really have to deal with the crowds.
I have done the dining package and felt it wasn’t worth it for several reasons. It is not seated and everyone is standing in the viewing area (no seating, unless VIP or disabled) and there can be crowding. Crowding can lead to unobstructed views (maybe this might only apply for the shorter humans, I’m 5”4 and felt the obstruction). However the only advantage to the dining package was that we were closer to the show than the FP viewers.
I booked the dessert! Figured with a 6,3, and 8 month old it will just be easier.