Hmmm idk I think Starkey understands Henry VIII better but Lipscomb understands Anne Boleyn better??
Like as historians not as people (because imo they’ve both said some…terrible things in the public sphere) I guess I’d say Starkey, he’s had a longer career and his Royal Inventory of Henry VIII has done so much for our understanding of both the man and the Henrician era. Lipscomb might catch up eventually but the research he’s done so far is invaluable and indispensable; a lot of historians mention him and his work in the dedications of their books and with good reason.