3.Nc3 is White's Strongest.
3.e5 is a close second. (Originally thought to be as benign as the Exchange, but many new ideas for White that are very strong came about around 2006/2007)
3.exd5 and 3.Nd2 are utter crap and give White nothing. Easy Equality for Black in both cases.
1.e4 e6 2.d4 d5 3.Nd2?! c5!! and now:
A) 4.Ngf3 Nf6 5.e5 Nfd7 and White is stuck playing the Korchnoi Gambit instead of main line closed Tarrasch, which White has nothing with correct play by black.
B) 4.exd5 exd5! and now:
B1) 5.Bb5+ Bd7! 6.Qe2+ Be7! 7.dxc5 temporarily wins a pawn, but again, with correct play, Black will eventually get the pawn back and White has no advantage.
B2) 5.Nf3 Nf6! (FAR SUPERIOR to the old 5.Nc6?! 6.Bb5 Bd6 7.dxc5 Bxc5+/=) 6.Bb5+ Bd7 and again White has Nada!
ThrillerFan, perhaps you best tell Michael Adams (fide rated 19) the Tarrasch is utter crap because he apparently does not know.
@ThrillerFan You are a very strong player and I recall that you used to play the French. What do you believe is white's strongest line against the Winawer if white wants to play 3. Nc3? I am looking at maybe switching from 3. Nd2 to 3. Nc3, and I have some good lines against 3...Nf6, but I am not sure what to play against black's more dynamic option.
What you said is correct. I played the French from 1997 to 2007, and quit playing it because while I could deal with the issues for Black after 3.Nc3, I wasn't willing to deal with two problems, 3.Nc3 and 3.e5 (many new ideas, all favoring White, came about around that time - 3.Nc3 is still the strongest, but 3.e5 has superceded 3.Nd2, which gives White nothing - I consider an equal game "nothing" for White - not saying 3.Nd2 is refuted, it's simply no better than 3.exd5).
That said, to me, against the Winawer, you need to go main line. See below:
In addition, check out the following article that I posted back in 2012. Both games contain flaws, but in both cases, with correct play, White gets a significant, if not winning, advantage. The results were a draw and a win for White.
http://www.ncchess.org/wordpress/2012/02/deja-vu/#more-1486