I think Pep rate size as one of our serious needs this summer. And in addition to other qualities, Rodri has height and size in spades. At 6 feet tall, Llorente is no slouch, but he isn't 6'3 like Rodri.
Both are good DMs and Pep can make them better. Rodri has been better the last 2 years (due to opportunity), is younger and has better size.
I rate Llorente's passing, dribbling, vision, closing speed, and ball distribution as better
I rate Rodri's, size, strength, ariel prowess, and calmness as better.
Their tacking is about even. Either would be a fantastic recruit in my opinion.