This is such a terrible dilemma. ;.; I want both just like everyone, but that's way too much money.
I HIGHLY suggest the cow if you want to collect both and are only buying on first. On ebay plushies have a spike of like $50 when the first come out. Now the cow is worth around $15 sometimes even $10. However the giant plushie is currently set at preorder without the game for $70!!!!! So I don't think the price is going to drop as fast. ;.; So the cow would be the better choice as it would save you money in the long run.