When two boats share the same hull type — in this case both the Grady-White Canyon 366 2010 and the Grady-White Marlin 300 2010 are modified 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 Grady-White Canyon 366 2010 measures 36,6 feet overall (2010), giving it roughly 4,0 additional feet of deck space compared to the Grady-White Marlin 300 2010 at 32,6 feet (2010). Weight tells a clearer story for trailering families: the Grady-White Marlin 300 2010 tips the scales at 8 221 lbs — 6 936 lbs less than the Grady-White Canyon 366 2010 at 1 285 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 1 050 hp, the Grady-White Canyon 366 2010 has a 350-hp advantage over the Grady-White Marlin 300 2010's 700-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Grady-White Canyon 366 2010 carries 42 gallons versus 3 gallons in the Grady-White Marlin 300 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 Grady-White Canyon 366 2010 is rated for 11 passengers, while the Grady-White Marlin 300 2010 caps at 9. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Grady-White Canyon 366 2010 could be the deciding factor.