I don't know who would win but I'd rather Loma's economical defensive skills over Whitaker's flashy defensive skills. Loma has very good positioning and footwork with minimal movement in defense. Very plain and effective.
Good match up. Loma throws more and misses while Pea clowns and slips. Pernell's deficiency in landing meaningful punches makes it close. It becomes a battle of footwork leaving onlookers divided. Whitaker SD12 Lomachenko
To be fair to him, 3 of those losses were right at the end of his career, with 2 of them being against prime versions of Oscar and Tito.