As before, the 'Skulls Eye Schooner' can be judged in two ways. going by the sail plan, i would consider it a Barque (see the site i linked above). However, real-world would again use the Sloop-of-war catagory also due to the size of the ship.
Personally, i've been going by the sail-plans (ex. calling Barracuda a brig). Since most LEGO sets are scaled for mini-figures, NOT real-world, it feels better to classify these ships by their sail-plans. Otherwise, for a real-world-sized pirate ship, it would be massive and VERY expensive! but to each his own.