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 2011 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?
The Seaway Boats 18 Sportsman 2013 carries a rated maximum of 50 hp. Engine data for the Seaway Boats 24 Coastal Hardtop 2011 wasn't available in our records — check the manufacturer's spec sheet before sizing a motor.
For family outings this is probably the sharpest distinction between the two. The Seaway Boats 24 Coastal Hardtop 2011 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 2011 could be the deciding factor.
Bottom line: Choose the Seaway Boats 24 Coastal Hardtop 2011 if your priority is putting more people on the water — it handles 7 passengers and at 24,0 ft it has the deck room to back that rating up comfortably. The Seaway Boats 18 Sportsman 2013 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.