The Sundance 201 Bay 2006 vs Sundance SV171 2010 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 201 Bay 2006 at 20,0 ft versus Sundance SV171 2010 at 17,1 ft. Weight tells a clearer story for trailering families: the Sundance 201 Bay 2006 tips the scales at 1 660 lbs - 410 lbs more than the Sundance SV171 2010 at 1 250 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 150 hp, the Sundance 201 Bay 2006 has a 60-hp advantage over the Sundance SV171 2010's 90-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Sundance 201 Bay 2006 carries 40 gallons versus 34 gallons in the Sundance SV171 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 Sundance 201 Bay 2006 is rated for 6 passengers, while the Sundance SV171 2010 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Sundance 201 Bay 2006 could be the deciding factor.
Bottom line: Choose the Sundance 201 Bay 2006 if your priority is putting more people on the water - it handles 6 passengers and at 20,0 ft it has the deck room to back that rating up comfortably. The Sundance SV171 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.