
Smaller was better for pirates. Draft which means how deep in the water a vessel floats was especially important for pirates. Big warships sent to capture pirates were usually deep draft vessels that couldn't chase the smaller pirate schooners and sloops into shallow water the small harbors and shallow creeks where pirates hid. Shallow draft pirates might also escape across shallow reefs that would tear the man 0' war's
bottom out.
Do pirates get seasick, well almost everyone seasick now and then, mostly at the beginning of a voyage. The awful feeling usually goes away in time. When sailors were seasick during a storm, there was nothing to do but throw up and keep sailing. After a long voyage, sailors had become so accustomed to the motion of a ship that walking on the solid land could make them landsick.