The Monterey 278SSX 2009 is a deep-V design and the Monterey 340SY 2010 is a modified-V design, so you're likely deciding between two noticeably 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 Monterey 340SY 2010 measures 35,3 feet overall (2010), giving it roughly 7,3 additional feet of deck space compared to the Monterey 278SSX 2009 at 28,0 feet (2009). Weight tells a clearer story for trailering families: the Monterey 340SY 2010 tips the scales at 14 200 lbs - 8 700 lbs less than the Monterey 278SSX 2009 at 5 500 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 425 hp, the Monterey 278SSX 2009 has a 50-hp advantage over the Monterey 340SY 2010's 375-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Monterey 340SY 2010 carries 210 gallons versus 89 gallons in the Monterey 278SSX 2009. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.