Some presentations involve a big, black and white outcome: who hosts the next Olympics, will the trip go through, etc. etc.
In the world of entertainment, the tension is part of the show, think Oscars or talent shows. In most other cases, postponing and building up to the long awaited verdict does not serve a clear purpose. People might actually be distracted and not really listening to your arguments, as they are frantically trying to figure out where you are heading to.
Better to say the answer straight in the first sentence, and then explain why.