Puyol spends a lot of time running back to recover lost position, sometimes costing the team. He is better than the likes of Jamie Carragher for sure, but "class" is stretching it when compared to other liberos in the game. Pique plays a unique position suited to Barcelona football. He plays a role somewhere between a traditional stopper and a defensive midfielder (like Mikkel) and doesn't require a lot of multiple tackles or touches. That being said, his one touch is pivotal once someone like Xavi wins the ball at midfield and then passes it back to him to start the forward triangulation.
"O people, we created you from the same male and female, and rendered you distinct peoples and tribes, that you may recognize one another. The best among you in the sight of GOD is the most righteous. GOD is Omniscient, Cognizant." (49:13)