Honestly, we go so much, we’d pick the Halloween party because of the novelty. But if it were just a once in a while trip (every few years), I’d still go with the full day. You can get a lot done with Genie plus. It eliminates the stress of compressing everything to five hours plus the bonus hours before the event. You get a chance at a couple of meals. Wouldn’t be worried about wasting time in things like Carousel of progress and Laugh Floor. Those can be used as fillers diuring a full day. Halloween parties tend to be go go go, get as much done as possible, maximize your time. I have also heard that some Halloween parties get extremely packed, making the presumably lower ride wait times not so short (We haven’t experienced this but we go in September). I’ve always thought this was a difficult scenario to choose from and it’s entirely up to the person and what they want to get out of the experience.