The Executive Branch is the most important to me because vested in the President of the United States, who also acts as head of state and Commander-in-Chief of the armed forces.
The President , vice president, the executive office of President and the cabinet make up this branch
In January 2013, President Obama issued 23 executive orders as part of his anti-gun-violence program. And this year, he used the speech to announce an order to increase the minimum wage for some federal contract workers.
I believe this branch is most powerful because although its control over a large, standing military versus calling on State militias was perhaps its greatest expansion but because the scope and scale of the Federal Government has increased over time.