Whitebeard vs Roger

Whitebeard and Roger are considered to be equal in combat ability. They fought each other for three days and nights on an island in the Grand Line, and the fight ended in a draw.
Whitebeard is known as the strongest man alive, thanks to his Devil Fruit, the Gura Gura no Mi, and his Haki abilities. The Gura Gura no Mi gives him the power to create shockwaves and quakes, and to sink islands.
Roger is known as the Pirate King, and he conquered the world using only Haki. He has the power to hear the voices of animals and inanimate objects.