I mean, the decision is a no brainer. You can buy the ones from Zara and be part of mule crowd, or you can spend all your money at Céline and know you have an authentic designer item that looks exactly like all the other mules from the 90's. It's your life.
I had the luxury of finding these in store and ended up walking away with them half a size larger (which I recommend for a fit like Elin Kling in the right image).
Get them at Zara here.