I must confess I don't know the difference between the iPhone X, XR, XS, XS Max. It all seems very confused and stinks of marketing getting their claws into it. It was simple when they were numbered sequentially. Now I wonder if there will ever be an iPhone 11 as that suggests there can't be a premium on the iPhone X* as people will poo-poo that.
The fourth is the XR. Which is, as TFA indicates, a head-scratcher of a product.