Both the Sundance B20CC 2013 and the Sundance NX21 2011 are modified-V designs, both built in fibreglass, so 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?
On paper these two are close siblings in the size department - Sundance B20CC 2013 at 19,8 ft versus Sundance NX21 2011 at 21,1 ft. Weight tells a clearer story for trailering families: the Sundance NX21 2011 tips the scales at 1 850 lbs - 380 lbs less than the Sundance B20CC 2013 at 1 470 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 - 130 hp for the Sundance B20CC 2013 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 24 gallons in the Sundance B20CC 2013. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
Both boats are rated for 8 passengers - a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.
Bottom line: Performance buyers should lean toward the Sundance NX21 2011 and its 150-hp ceiling. If fuel economy and quieter running matter more than top-end speed, the Sundance B20CC 2013 with its 130-hp rating is the more economical daily driver.