Spinazzola is better, both have had major injuries hindering their careers. Pellegrini is 6 years younger and is fine with the bench spot(you go from Cagliari playtime to Juve bench), while Spina has been itching to play and has been close to leaving last summer and past January, wants and needs playing time since returning from massive injury. And being backup to Sandro is most likely not what he wants, he is shoe in as starting spot for Azzurri if he plays in club level.
But most likely its also because of plusvalenza boost in our books, it would be 22m plus in our accounting now that we sold him for 25m. He has been our player since teens so was brought in for nearly nothing for primavera.
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