The team would benefit more from Henry because at his prime he was not actually human but a machine. Pure productivity.
That said, I would still choose Bergkamp because I'm a fan of the cool, the naturally gifted and the martyr who would be several steps ahead of everyone else on the pitch but is willing to go down with a sinking ship.
i.e. there's a danger that Henry could actually single-handedly save us and that'd be a fun story but it's not my style. Bergkamp wouldn't save us but we'd be cooler.