Which one is better, Canon 18-135 lens or Sigma 18-200 lens?

The Canon 18-135 lens is better.

Canon is a world-leading comprehensive group in Japan that produces imaging and information products. It specializes in the production of imaging, optics, medical equipment, semiconductor industrial equipment and office automation products. Since its establishment in 1937, Canon , after years of unremitting efforts, Canon has globalized and expanded its business into various fields.

Canon’s product series are mainly distributed in three major areas: personal products, office equipment and industrial equipment. Its main products include cameras and lenses, digital cameras, printers, copiers, fax machines, scanners, and broadcasters. Equipment, medical equipment and semiconductor production equipment, etc. Canon is headquartered in Tokyo, Japan, and has four regional sales headquarters in the Americas, Europe, Asia and Japan. It has 200 subsidiaries around the world and employs more than 100,000 people.