The silo or the license?
The silo. The license is worthless after the event, it's just a bit of coding that is gone when the event ends. The silo on the other hand gives you Plopper AKA "Spider Pig" who is a playable chara...
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I went with the silo since it gives me another character. They have something like the license in every event and I've always been able to complete them without it. I much prefer to spend my donuts on buildings and characters I can keep.
