Washington by a country mile. He was literally the perfect man for the job.
The job was also created to fit the man
To be fair he rebuffed attempts to make him a monarch and set the precedent that the President didn't serve for a lifetime.
But as far as pure leadership ability goes, Washington really was not brilliant at it. He was not a great public speaker (could scarcely speak at all, for the pain in his teeth); did not command the loyalty even of those who ostensibly supported his policy goals (Hamilton intrigued against Washington almost as much as against Jefferson); and did not inaugurate any great transformation in the way politics was done in the country, the basic outline of American bicameralism being present under the Articles.
Washington as "Father Of His Country" is the Greatest Of All Time. Washington the historical character would probably be remembered on a par with a Chet Arthur or a Benjamin Harrison - good, but not remotely memorable - if not for his status as the first President, or if he were President at some period after the first term of office. Roosevelt was unquestionably better at the job;
most of the Great Presidents were better at it, though not necessarily that much so.