Which is more important. The presentation or the telling?
They are equally important. If you are not telling the truth then what you are telling them is useless. If you are presenting the truth in such a way that it causes them to refuse to listen, it makes the truth equally useless.
When I was in college a young man in a 3 piece suit came to campus. He stood in the square and called all the students whores and whore mongers. Given the nature of college campuses, he was probably more right than wrong. He was yelling that God loved us anyway abut we must turn away from our evil ways. About this time a gay kid came up to him asked if God loved him too. Our proud, card carrying member of the Moral Majority, replied, "Yes, you miserable sot."
Now, what this you evangelist was saying about the students was probably more true than not. Most probably did not know Christ and needed. But, because of his presentation, he was seen as an amusing moment of street theater. Everybody there ganged up on him and attacked him and his morals. Nobody came forward to be saved. His net effect for Christ that day was close to zero. It is possible that his words hit somebody in the heart an they later came to Christ because of this preacher. I don't know. What I saw, was a young man who drove more people away from Christ than towards Him.
Remember always, the great commission says to go forth and make believers of all nations. IT does not say go forth a rebuke all men, it says make believers. Paul even used different approaches depending on his audience. He went as a Jew to Jew's and as a Gentile to Gentile's. If our presentation of the truth does more to drive people away from Chrsit than toward Him, then we are violating our commission.