Carrack

Carrack is a three or four masted large enough to be stable in heavy seas, and for a large cargo and the provisions needed for very long voyages. Carracks got a high rounded stern with large aftcastle, forecastle and bowsprit at the stem. This ship is the best ship you can get. It rode high in the water with the prominent forecastle (along with the usual sterncastle) giving it a characteristic "U" shape.

Its size only will keep all the pirates away and provide space for a lot of cargo, carrying capacity of can reach over 1000 tons making it perfect for grand trade companies. Its size also allows to transport thousands of warriors making it a floating castle. Its masts and strong hull makes carrack the only ship that can sail in open seas without any high risks, many masts allow this ship to reach fast speeds in open seas with strong wind. The high sides made it virtually impregnable to attack from small craft. Also its size and stability allows effective use of cannons.
Carracks have few disadvantages main one being its cost. Carrack are very expensive to make and only rich countries can afford to build this monstrosity. Second minor advantage is a fairly big crew of around 50 skilled sailors needed to operate it.

Speed

3-7 knots (depending on wind)