I voted for Nas, but let me say this;
People hyped Nas up to be the socially conscious rapper after the Takeover/Ether battle.
But One Mic was kinda pseudo-scientifical. Back in the late 80s/early 90s there were tons of groups that made songs like One Mic; KRS One, X-Clan, Poor Righteous Teachers, Positive Black, Divine Styler to name a few.
In fact, I'm going to make a thread about that.