I don't think they look chunkier at all to me. I will go back to the VZW store and do a side by side with my 8 plus and the XL2. I think the side bezels are bigger on the iphone. Even in the picture you posted the side bezels look bigger on the iphone.
Pixel xl2 Definitely looks chunkier to me.
At least your not claiming the pixel xl 2s bezels are nearly identical to the iPhone x.
Mind taking a side by side with the iPhone 8 plus.