In AW I flew B alot (when I wasn't flying for A or C) because I liked red better than light blue or green -- YMMV.
Here, when I'm not flying for Bishop or Rook, I fly Knight because it's the most impressive Chess piece, IMO, and has a connotation to "Knights of the Air."
Haven't been flying all that much lately because it's been summer in Chicago, but I can gurantee I'll be flying a lot more for Knights, Rooks or Bishops come fall.
Charon