What is the most powerful tornadoe in history?

Hello I am new two tornados and I want to know what the most powerful torando is in history. Me personally I think the most powerful tornado in history is the Jarel EF5 in 1997 because of the dead man walking, but the most powerful tornado in history might be More, Oaklahoma 1999 because of the dopler on wheels radar scan. Also a lot of people say Smithville is the most powerful tornado is in history, so it also might be that. And a white guy on twitter also said Mayfeild is also the most powerful tornado in history. Could it be that as well. What do you guys think is the largest tonardo in history is?