Hi, we have experienced both.
I would choose the HDR, however DH and the kids would choose Backyard BBQ.
My biggest complaint about the BYBBQ is that it is outdoors, therefore it was HOT and HUMID.
Now, you are going in October and maybe a little less heat.
I had a great time, dancing with the kids taking their pics dancing and loving them having a great time.
While I didn't get a chance to eat, I have to say no one thought much of the food anyway, but the kids had so much fun, dancing the night away. Sweat'n' to Disney.
At HDR, you are inside with AC and you actually get to eat. It was really enjoyable for me and the family. When I would pick HDR over BYBBQ, myself and the other women of the family would be the only ones from our family to pick it.