Matching a modified vee Klamath 18 ft. OSW 2005 against a deep vee Klamath 21 ft. Baja 2013 means you're likely deciding between two genuinely different on-water experiences. Hull type shapes everything from ride quality and fuel burn to dock handling and resale trajectory.
Size is the most obvious dividing line here. The Klamath 21 ft. Baja 2013 measures 21,3 feet overall (2013), giving it roughly 3,3 additional feet of deck space compared to the Klamath 18 ft. OSW 2005 at 18,0 feet (2005). Weight tells a clearer story for trailering families: the Klamath 21 ft. Baja 2013 tips the scales at 115 lbs — 108 lbs less than the Klamath 18 ft. OSW 2005 at 7 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.
The power gap is worth calling out. Rated to 150 hp, the Klamath 21 ft. Baja 2013 has a 75-hp advantage over the Klamath 18 ft. OSW 2005's 75-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
Both boats are rated for 8 passengers — a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.
Bottom line: The Klamath 21 ft. Baja 2013 at 21,3 ft is the right call if deck space, comfort, and entertaining are top of your list. The Klamath 18 ft. OSW 2005 at 18,0 ft wins on trailering ease, likely lower purchase price, and simpler docking — a solid choice for a buyer who wants more boat for less money.