The Sundance SV186 2011 vs Sundance SV205Bay 2007 comparison sits squarely in the category of decisions where specs alone won't tell the whole story: intended use, storage, and long-term ownership costs all factor in.
On paper these two are close siblings in the size department - Sundance SV186 2011 at 18,5 ft versus Sundance SV205Bay 2007 at 20,0 ft. Weight tells a clearer story for trailering families: the Sundance SV205Bay 2007 tips the scales at 1 980 lbs - 530 lbs less than the Sundance SV186 2011 at 1 450 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.
Both boats share a closely matched power ceiling - 150 hp for the Sundance SV186 2011 and 150 hp for the Sundance SV205Bay 2007. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup. Fuel capacity breaks the other way: the Sundance SV205Bay 2007 carries 45 gallons versus 40 gallons in the Sundance SV186 2011. 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 Sundance SV205Bay 2007 is rated for 7 passengers, while the Sundance SV186 2011 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Sundance SV205Bay 2007 could be the deciding factor.
Bottom line: Choose the Sundance SV205Bay 2007 if your priority is putting more people on the water - it handles 7 passengers and at 20,0 ft it has the deck room to back that rating up comfortably. The Sundance SV186 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.