An 1870s admiral commanding a fleet in the 1670s

How would an admiral from the 1870s fare in the 1670s, and what would serve as the flagship?

The expectation is that the admiral would outperform the other commanders in the fleet and choose the largest available warship as flagship.

The answer favors the largest available warship as the visiting admiral's flagship and expects the nineteenth-century officer to outperform the other commanders in the fleet. It gives no particular ship class or explanation of how the officer would adapt to seventeenth-century equipment and tactics.