Both the Mariah G25 2010 and the Mariah G270 2011 are modified-V designs, the first built in fibreglass and the second in aluminium, 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 G25 2010 at 25,2 ft versus Mariah G270 2011 at 27,0 ft. Weight tells a clearer story for trailering families: the Mariah G270 2011 tips the scales at 8 200 lbs - 3 300 lbs less than the Mariah G25 2010 at 4 900 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.
Both boats share a closely matched power ceiling - 425 hp for the Mariah G25 2010 and 425 hp for the Mariah G270 2011. 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. Fuel capacity breaks the other way: the Mariah G25 2010 carries 90 gallons versus 75 gallons in the Mariah G270 2011. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
For family outings this is probably the sharpest distinction between the two. The Mariah G25 2010 is rated for 12 passengers, while the Mariah G270 2011 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Mariah G25 2010 could be the deciding factor.
Bottom line: Choose the Mariah G25 2010 if your priority is putting more people on the water - it handles 12 passengers and at 25,2 ft it has the deck room to back that rating up comfortably. The Mariah G270 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 8 that costs less to run day-to-day.