Both the Mariah G21 2012 and the Mariah SC21 Cuddy Cabin 2008 are modified-V designs, the first built in aluminium and the second in fibreglass, so 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?
On paper these two are close siblings in the size department - Mariah G21 2012 at 21,4 ft versus Mariah SC21 Cuddy Cabin 2008 at 20,0 ft. Weight tells a clearer story for trailering families: the Mariah G21 2012 tips the scales at 3 600 lbs - 300 lbs more than the Mariah SC21 Cuddy Cabin 2008 at 3 300 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 300 hp, the Mariah G21 2012 has a 40-hp advantage over the Mariah SC21 Cuddy Cabin 2008's 260-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Mariah SC21 Cuddy Cabin 2008 carries 44 gallons versus 35 gallons in the Mariah G21 2012. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
Both boats are rated for 10 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: Performance buyers should lean toward the Mariah G21 2012 and its 300-hp ceiling. If fuel economy and quieter running matter more than top-end speed, the Mariah SC21 Cuddy Cabin 2008 with its 260-hp rating is the more economical daily driver.