When two boats share the same hull type — in this case both the Mariah G21 2010 and the Mariah SX21 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 G21 2010 measures 20,8 feet overall (2010), giving it roughly 18,8 additional feet of deck space compared to the Mariah SX21 2009 at 2,0 feet (2009). At 39 lbs and 36 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.
Both boats share a closely matched power ceiling — 270 hp for the Mariah G21 2010 and 270 hp for the Mariah SX21 2009. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup. Both carry nearly identical fuel loads — 44 gal and 44 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 G21 2010 at 20,8 ft is the right call if deck space, comfort, and entertaining are top of your list. The Mariah SX21 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.