The Cobia Boats 256 Express 2009 vs Cobia Boats 312 SC 2006 comparison sits squarely in the category of decisions where specs alone won't tell the whole story: intended use, storage, and long-term ownership costs all factor in.
Size is the most obvious dividing line here. The Cobia Boats 312 SC 2006 measures 30,0 feet overall (2006), giving it roughly 5,0 additional feet of deck space compared to the Cobia Boats 256 Express 2009 at 25,0 feet (2009). Weight tells a clearer story for trailering families: the Cobia Boats 312 SC 2006 tips the scales at 7 300 lbs - 2 600 lbs less than the Cobia Boats 256 Express 2009 at 4 700 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 600 hp, the Cobia Boats 312 SC 2006 has a 250-hp advantage over the Cobia Boats 256 Express 2009's 350-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Cobia Boats 312 SC 2006 carries 270 gallons versus 150 gallons in the Cobia Boats 256 Express 2009. 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 Cobia Boats 312 SC 2006 is rated for 9 passengers, while the Cobia Boats 256 Express 2009 caps at 7. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Cobia Boats 312 SC 2006 could be the deciding factor.
Bottom line: Choose the Cobia Boats 312 SC 2006 if your priority is putting more people on the water - it handles 9 passengers and at 30,0 ft it has the deck room to back that rating up comfortably. The Cobia Boats 256 Express 2009 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 7 that costs less to run day-to-day.