After Hours Event. That's what I am doing this trip. I've done the parties before and being able to just wander around, no planning, no crowds, no lines, well worth it.
MK Dessert Party we did once (the during the show one), and it cost a fraction back then over what it does now. I didn't really think it was worth it when it was only around $30 / person, so definitely not worth it now. It was nice to have a seat and be covered because it actually rained on our dessert party night, but other than that, not worth it. I would rather grab a snack and watch fireworks for free somewhere else or possibly look into a meal that has seating.
Never done a Disney tour, but Busch Gardens use to have a tour that cost around $100 per person, and it was more than worth it. I think its like $400 now, though. Highly, recommend it, though, if it is something someone can afford. I have no desire to go any other way. Busch Gardens shuts all their rides down all the time because of lightning. I've found it's almost impossible to ride anything without the tour because rides will only be running for 5 to 20 minutes at a time in the summer, so you need the front of the line access to jump on right away when they are up.