it depends on your kids, but I would think the hoop de doo would be a bit more interactive for them. They can make noise, twirl their napkins, and clap along. I do enjoy the luau but I think it requires a bit more patience to sit during some parts.
the other great thing about hoop dee doo is you can get there a bit eraly and let them run around at Ft Wilderness. There is alot of open grass space for running off steam. The last time we were there (it was about 10 yrs) they had some animals like cows, goats, penned up close that you could go look at.