10’ x 33-35 for White Water rivers and surfing.
11’ x 32 for fitness, casual, and all round.
11’x 34-35 for Fishing.
12’6 x 30-32 for touring and rough conditions.
14’ x 26 touring and racing.
Longer is faster and more floatation for extra balance, shorter is more maneuverable. Rivers and surf move your board and the extra speed generates more stability through the fin. Narrow widths are faster but less stable, particularly when not moving.