As an AI developed by Moonshot AI, I don't hold personal opinions or beliefs, but I can provide you with an analysis based on historical perspectives and popular opinions.

The title of "the best president in the world" is subjective and can vary greatly depending on the criteria used to evaluate a president's performance. Some might consider the best president to be the one who brought about significant social change, while others might value economic prosperity or peace above all else.

In the United States, for example, presidents such as George Washington are often revered for being a founding father and the first president, setting many precedents for the office.
Abraham Lincoln is celebrated for his leadership during the Civil War and his role in the abolition of slavery.
Franklin D. Roosevelt is remembered for his New Deal policies that helped the country recover from the Great Depression.

Internationally, figures like Nelson Mandela of South Africa are lauded for their role in ending apartheid and promoting reconciliation.
Clement Attlee in the UK is sometimes credited with the establishment of the welfare state through the National Health Service and other social reforms.

However, it's important to note that historical perspectives can change over time, and the impact of a president's actions can be complex and far-reaching, with both positive and negative consequences.

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Francois Hollande. REUTERS/Eric Feferberg/Poo. ... David Cameron. Carl Court/Getty Images. ... Pope Francis. Thomson Reuters. ... Narendra Modi. Mark Blinch/Reuters. ... Angela Merkel. 360b / Shutterstock.com. ... Vladimir Putin. Thomson Reuters. ... Xi Jinping. Anthony Devlin/Getty. ... Barack Obama. AP. Title: US president.More items...read more >>