We took my then 2 year old to BBQ and she LOVED it. I can't tell you how much fun we had. We had wonderful character interaction and the pictures of her dancing with Mickey, Minnie, Goofy and Chip & Dale are priceless. It was hot and yes, a bit chaotic at first, but really wasn't bad, especially after the first round of dancing. We're going back in July for a Mommy & Me dinner at the BBQ.
That being said, I don't think you can go wrong with either choice. I've heard great things about the Hoop. I'm considering it for our September trip, but I honestly just don't know if it is something my now 3 year old would want to sit though. She's more of an "active participant" so the BBQ works great for her! Plus, by the time we left, she was exhausted and went right to sleep, so bonus!