The superiority of Common Law is so seld-evident as to be unarguable.
Nations with British lega ltraditions are far more successful than ones with French traditions, and the Spanish Civil Law nations are abysmal.
Louisiana is unique, and has had 200 years to conform with Common Law- which it mostly does. PR can’t wait 200 years.
I would point out the Puerto Rico has worked within the U.S. legal system since 1898. Over 120 years and counting.