I’ve driven both a 3.5 NC Super 200 and currently own a ND 1 Super 200 so can’t comment on the standard NC 2 but both have their own plus points.
Both NC and ND ran Ohlins and Team Dynamics so like for like very even comparison.
NC felt a bit more fun, more playful. Steering feel is better on the NC, but ND is lighter so feels faster than NC. Both engines feel fantastic, especially if you add the BBR exhaust. Both will rev out to about 7,500rpm and there is definitely a strong pull higher up the Rev range, but will still happily pull strongly at lower revs.
One big difference is you’ve got to be trying really hard to get the ND to go below 30mpg, at a cruise it can crack 40mpg at ease, whereas the NC is miles off that.
Other major difference is the refinement. ND in a different league compared to the NC (roadster). ND so much more refined as well as a far better cabin.
But purely judged as driving machines, both are great, especially if you take them to BBR!