Nimzo-Indian vs QGD


Not sure what your source is or if you are even figuring it out right (many on here do not).
If you were to use 365chess and select the masters database rather than the big database (big database includes garbage played by chumps), 1.d4 d5 2.c4 e6 scores 44.1% for Black, 1.d5 Nf5 2.c4 e6 scores 45.1 for Black. Remember, White is not forced to play 3.Nc3, so could end up Catalan, QGD, QID, Bogo, etc.
Black's score is Black win percentage plus half the draw percentage, so if you have 40 percent wins for White, 30 percent draws, and 30 percent Black wins, Black scores 45%.