When two boats share the same hull type — in this case both the Monterey 234FSX 2010 and the Monterey 340SY 2009 are modified vee designs with fiberglass construction — the buying decision usually comes down to a handful of practical questions: how many people are you putting on the water, how far do you trailer, and what does your tow vehicle weigh?

Size is the most obvious dividing line here. The Monterey 340SY 2009 measures 35,0 feet overall (2009), giving it roughly 11,0 additional feet of deck space compared to the Monterey 234FSX 2010 at 24,0 feet (2010). At 43 lbs and 142 lbs respectively, both sit in a similar weight class — either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.

The power gap is worth calling out. Rated to 375 hp, the Monterey 340SY 2009 has a 55-hp advantage over the Monterey 234FSX 2010's 320-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 234FSX 2010 carries 62 gallons versus 21 gallons in the Monterey 340SY 2009. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

The Monterey 234FSX 2010 is rated for up to 1 people. Passenger data for the Monterey 340SY 2009 wasn't available.