When two boats share the same hull type — in this case both the Glastron GS 259 2008 and the Glastron GT 185 2008 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 Glastron GS 259 2008 measures 24,0 feet overall (2008), giving it roughly 6,0 additional feet of deck space compared to the Glastron GT 185 2008 at 18,0 feet (2008). Weight tells a clearer story for trailering families: the Glastron GS 259 2008 tips the scales at 5 525 lbs — 3 210 lbs more than the Glastron GT 185 2008 at 2 315 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 320 hp, the Glastron GS 259 2008 has a 130-hp advantage over the Glastron GT 185 2008's 190-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Glastron GS 259 2008 carries 56 gallons versus 23 gallons in the Glastron GT 185 2008. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

The Glastron GS 259 2008 is rated for up to 7 people. Passenger data for the Glastron GT 185 2008 wasn't available.