I think Burgum, his more quiet and moderate demeanor would make him a good fit for the rust belt suburbs that are critical in the election. While Vance may have some appeal (its debateable) most of it overlaps with Trump already. Burgum would be able to tap into a different set of voters that Trump traditionally struggles with.
Biden won when he said that Trump tax cuts favor the rich with oil subsidies, you forgot why Biden won in 20 with his tax cuts for the rich. Burgum and Vance come from oil states that will double down on tax cuts for the rich