I prefer the Queenside bishop, because it can directly attack the opponenets kingside. doesnt really matter with the knights or rooks, since they can guard squares of any color.
King Pieces vs Queen Pieces vs The Dark Side...

there is only one side.....the dark side. join or die. anakin skywalker did and so should you. plus you get a cool black mask and is awesome cause you can hear yourself breathing.
which are the most flexible in the opening?
which ones can protect the king better?
which ones are the most flexible?
etc...