When two boats share the same hull type — in this case both the Seaway Boats 18 Sportsman 2013 and the Seaway Boats 24 Coastal Hardtop 2012 are deep 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 Seaway Boats 24 Coastal Hardtop 2012 measures 24,0 feet overall (2012), giving it roughly 6,0 additional feet of deck space compared to the Seaway Boats 18 Sportsman 2013 at 18,0 feet (2013). Weight tells a clearer story for trailering families: the Seaway Boats 24 Coastal Hardtop 2012 tips the scales at 395 lbs — 384 lbs less than the Seaway Boats 18 Sportsman 2013 at 11 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 130 hp, the Seaway Boats 24 Coastal Hardtop 2012 has a 80-hp advantage over the Seaway Boats 18 Sportsman 2013's 50-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Seaway Boats 24 Coastal Hardtop 2012 carries 64 gallons versus 4 gallons in the Seaway Boats 18 Sportsman 2013. 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 Seaway Boats 24 Coastal Hardtop 2012 is rated for 7 passengers, while the Seaway Boats 18 Sportsman 2013 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Seaway Boats 24 Coastal Hardtop 2012 could be the deciding factor.