When two boats share the same hull type — in this case both the Mariah FS20 2009 and the Mariah R19.9 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 Mariah R19.9 2009 measures 19,0 feet overall (2009), giving it roughly 17,0 additional feet of deck space compared to the Mariah FS20 2009 at 2,0 feet (2009). At 355 lbs and 365 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 260 hp, the Mariah FS20 2009 has a 35-hp advantage over the Mariah R19.9 2009's 225-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads — 38 gal and 38 gal — so range won't be a tiebreaker here.
Both boats are rated for 1 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 Mariah R19.9 2009 at 19,0 ft is the right call if deck space, comfort, and entertaining are top of your list. The Mariah FS20 2009 at 2,0 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.