I like your posts, Dax -- in particular some of your work in the Stones thread -- but your absolute disdain for alternative opinions is a bit arrogant sometimes. I think Otamendi is a better footballer, in particular for what Pep traditionally has had in mind, but I think Mangala was a better defender last season. It's not beyond ridiculous. It's not a case of them "not even being close." It's certainly not a case of one player being light years ahead of another. Just two people coming to different conclusions, as everybody is wont to do.
I get it, you prefer Otamendi. Lots of sound arguments for him. Not sure you have to be pompously dismissive of the people who disagree with you though.