Who was the best accordion player?

Determining the "best" Accordion player is subjective, but many consider Astor Piazzolla to be one of the greatest due to his innovative contributions to tango music and the accordion's role within it. His compositions transformed the traditional tango into a more contemporary genre, showcasing the accordion's versatility. Other notable accordionists include Frank Marocco and Myron Floren, each Excelling in their respective styles and genres. Ultimately, the title of "best" can vary depending on personal taste and musical context.