When two boats share the same hull type — in this case both the Monterey 204FSX 2012 and the Monterey 400SY 2012 are deep 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 400SY 2012 measures 41,0 feet overall (2012), giving it roughly 21,4 additional feet of deck space compared to the Monterey 204FSX 2012 at 19,6 feet (2012). At 31 lbs and 22 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 435 hp, the Monterey 400SY 2012 has a 165-hp advantage over the Monterey 204FSX 2012's 270-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads — 36 gal and 33 gal — so range won't be a tiebreaker here.

The Monterey 204FSX 2012 is rated for up to 1 people. Passenger data for the Monterey 400SY 2012 wasn't available.