As a general rule, a longer kayak is faster: it has a higher hull speed. It can also be narrower for a given displacement, reducing the drag, and it will generally track (follow a straight line) better than a shorter kayak. On the other hand, it is less maneuverable. Very long kayaks are less robust, and may be harder to store and transport. Some recreational kayak makers try to maximize hull volume (weight capacity) for a given length as shorter kayaks are easier to transport and store.
as a general rule a longer kayak is faster it has a higher hull speed it can also be narrower for a given displacement reducing the drag and it will generally track (follow a straight line) better than a shorter kayak on the other hand it is less maneuverable very long kayaks are less robust and may be harder to store and transport some recreational kayak makers try to maximize hull volume (weight capacity) for a given length as shorter kayaks are easier to transport and store