Both the Nor-Tech 344 GT 2013 and the Nor-Tech 427V 2013 are deep-V designs, both built in composite, 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?
Size is the most obvious dividing line here. The Nor-Tech 427V 2013 measures 42,6 feet overall (2013), giving it roughly 8,6 additional feet of deck space compared to the Nor-Tech 344 GT 2013 at 34,0 feet (2013). Weight tells a clearer story for trailering families: the Nor-Tech 427V 2013 tips the scales at 10 500 lbs - 1 500 lbs less than the Nor-Tech 344 GT 2013 at 9 000 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.
For family outings this is probably the sharpest distinction between the two. The Nor-Tech 427V 2013 is rated for 12 passengers, while the Nor-Tech 344 GT 2013 caps at 10. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Nor-Tech 427V 2013 could be the deciding factor.
Bottom line: Choose the Nor-Tech 427V 2013 if your priority is putting more people on the water - it handles 12 passengers and at 42,6 ft it has the deck room to back that rating up comfortably. The Nor-Tech 344 GT 2013 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 10 that costs less to run day-to-day.