The Sundance 201 Bay 2006 vs Sundance NX21 2011 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.
Size is the most obvious dividing line here. The Sundance NX21 2011 measures 21,1 feet overall (2011), giving it roughly 19,1 additional feet of deck space compared to the Sundance 201 Bay 2006 at 2,0 feet (2006). At 166 lbs and 185 lbs respectively, both sit in a similar weight class — either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.
Both boats share a closely matched power ceiling — 150 hp for the Sundance 201 Bay 2006 and 150 hp for the Sundance NX21 2011. 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 NX21 2011 carries 45 gallons versus 4 gallons in the Sundance 201 Bay 2006. 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 NX21 2011 is rated for 8 passengers, while the Sundance 201 Bay 2006 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Sundance NX21 2011 could be the deciding factor.
Bottom line: Choose the Sundance NX21 2011 if your priority is putting more people on the water — it handles 8 passengers and at 21,1 ft it has the deck room to back that rating up comfortably. The Sundance 201 Bay 2006 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.