Abandoned Store

If you really want the store, I would go with the Store considering it's "Limited Time". Otto will always be there and like you said, you can easily get the 20 additional donuts you would need by getting a scratcher or two. Also by leveling up through bonus levels, collecting bonus emblems or finding them in friends towns.

They should give Number 1 a task there after the event. 4hrs - Attend the No Homers Meeting

They should also release Homer Glumplich and give him a task there as well.