I'd keep HDDR.
In my experience, I've never met a kid who didn't love that one.
Kid reviews on Aloha are mixed - my nephew liked the show (at 8), but his little brother (at age 5) thought the whole evening was boring and asked to go back to the room (!) about twelve times before we actually did. I can't say that I blame him all that much - the Spirit of Aloha has never been a must-do for me, either.