Since you are an attacking player, then nc3 is DEFINITELY the  move for you. Ive said it before in other french discussions & I'll say it again here.....Nc3 IS the best 3rd move at white's disposal. Since you dont have any hangups against the Winawer hence there are no disadvatages to that move in your case. (unlike me  , hence exchange var.) Further,it definitely exerts more central pressure & has greater range than Nd2.

The only advantage of Nd2 is that it prevents the Winawer. That's why people like Karpov play it & it gives rise to the type of game more congenial to their style. (too slow & dry for my liking) So the positionally inclined will favour this move to Nc3. The disadvantage to Nd2 was mentioned in the last part of the above paragraph.