The Fury is an updated version of the Yukon. It has a faster cam system, and if I' m not mistaken, the Express cam on the Fury is more adjustable for fine-tuning draw length.
I doubt that there is a significant difference between the two bows in most respects. I would agree with another response that you got. " Which one do you like better?"
Sorry to hear your wife is demanding that you sell one of them though.