I agree with 080081. President Teddy Roosevelt was the most progressive president of the 3.
Roosevelt, with his reforms against big corrupt businesses also campaigned for woman suffrage, minimum wage laws, conservation of forests and helped labor unions.
Examples of Roosevelt's progressivism would be when he threatened to seize the anthracite coal mines of Pennsylvania. This deed was in favor of the workers on strike and as a result, the workers were granted 9 hours work days and a 10% increase in wage.
Roosevelt with his big 'trust busting' stick only sought to bust trusts which were corrupt. He did not see all big corporations as bad and thus, he was just.
Woodrow Wilson also had similar views to those of Roosevelt's, but he "shunned social welfare proposals." He mainly looked to destroy monopolistic corporations and to deal with economic issues. He also never sought to better the treatment of blacks as he a southerner and even encouraged segregation in the federal bureaucracy.
President Taft was a big buster of trusts. He filed about 90 suits against trusts when he was president, as compared to Roosevelt's 44 and was not just, in that he saw all big corporations were corrupt. He also did not bother himself with social issues.
Therefore, Roosevelt was the most progressive president, as he dealt with social issues, conservation of forests, and the fair- busting of actual corrupt corporations, not just 'big ones'.