Best chess piece is always your opponents king, it's the only piece that guarantees a skewer, pin, discovered check, windmill, double check, and most important of all checkmate.
Yeah, even your queen can't do that.
Clubs
Chess University
109,150 Members
Slow Chess League
3,892 Members
Dan Heisman Learning Center
17,673 Members
Frank Marshall golden team
798 Members
World Standard Time Control Chess Club 365 Days a year
4,307 Members