I'll start with Calvin Coolidge. Any president who starts his speech with " I believe in the American constitution" and means it, is great!

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As for my least favorite, I'd say Wilson. What he did in his office has led to the destruction of the fundamental structure of the federal government to become the leviathan it is today.

In his first term as President, Wilson persuaded a Democratic Congress to pass major progressive reforms. Historian John M. Cooper argues that, in his first term, Wilson successfully pushed a legislative agenda that few presidents have equaled, and remained unmatched up until the New Deal.[1] This agenda included the Federal Reserve Act, Federal Trade Commission Act, the Clayton Antitrust Act, the Federal Farm Loan Act and an income tax. Child labor was curtailed by the Keating–Owen Act of 1916, but the U.S. Supreme Court declared it unconstitutional in 1918. He also had Congress pass the Adamson Act, which imposed an 8-hour workday for railroads.[2] Wilson, at first unsympathetic, became a major advocate for women's suffrage after public pressure convinced him that to oppose woman's suffrage was politically unwise. Although Wilson promised African Americans "fair dealing...in advancing the interests of their race in the United States" the Wilson administration implemented a policy of racial segregation for federal employees.
Narrowly re-elected in 1916, he had full control of American entry into World War I, and his second term centered on World War I and the subsequent peace treaty negotiations in Paris. He based his re-election campaign around the slogan, "He kept us out of war", but U.S. neutrality was challenged in early 1917 when the German Empire began unrestricted submarine warfare despite repeated strong warnings and tried to enlist Mexico as an ally. In April 1917, Wilson asked Congress to declare war. During the war, Wilson focused on diplomacy and financial considerations, leaving the waging of the war itself primarily in the hands of the Army. On the home front in 1917, he began the United States' first draft since the American Civil War, borrowed billions of dollars in war funding through the newly established Federal Reserve Bank and Liberty Bonds, set up the War Industries Board, promoted labor union cooperation, supervised agriculture and food production through the Lever Act, took over control of the railroads, and suppressed anti-war movements. During his term in office, Wilson gave a well-known Flag Day speech that fueled the wave of anti-German sentiment sweeping the country in 1917–18.