I know Blackmagic is a popular brand for actual cine camera equipment, how do they compare to the more common Elgato 4K60 PCIe? Obviously thunderbolt is nice a

I know Blackmagic is a popular brand for actual cine camera equipment, how do they compare to the more common Elgato 4K60 PCIe? Obviously thunderbolt is nice as an interface rather than the add-in card, but is there anything else it offers above and beyond that?