What's the most fun or unique Event to play? Ignoring farming for items or xp.

Recently watched a video on the best Events to play, but what I realized is that most of the ones listed were because they are great for grinding or had good reward items.

But I'm wondering which ones are the most fun to play. Particularly one that isn't just defend 3 things while waves of enemies spawn. ,😅

One that comes to mind are the Nula World ones where you have the spinning wheel and the heist events. Though I forget their names.