When two boats share the same hull type — in this case both the Weldcraft Marine 18 SJ 2010 and the Weldcraft Marine 300 2009 are deep vee designs with aluminum 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 Weldcraft Marine 18 SJ 2010 measures 18,1 feet overall (2010), giving it roughly 15,1 additional feet of deck space compared to the Weldcraft Marine 300 2009 at 3,0 feet (2009). Weight tells a clearer story for trailering families: the Weldcraft Marine 18 SJ 2010 tips the scales at 205 lbs — 146 lbs more than the Weldcraft Marine 300 2009 at 59 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 Weldcraft Marine 300 2009 tops out at 500 hp. Engine specs for the Weldcraft Marine 18 SJ 2010 aren't listed — confirm with a dealer before selecting an outboard.Fuel capacity breaks the other way: the Weldcraft Marine 300 2009 carries 175 gallons versus 42 gallons in the Weldcraft Marine 18 SJ 2010. 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 Weldcraft Marine 300 2009 is rated for 9 passengers, while the Weldcraft Marine 18 SJ 2010 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Weldcraft Marine 300 2009 could be the deciding factor.
Bottom line: Choose the Weldcraft Marine 300 2009 if your priority is putting more people on the water — it handles 9 passengers and at 3,0 ft it has the deck room to back that rating up comfortably. The Weldcraft Marine 18 SJ 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.