Depends entirely on the opening being played and the game situation. I like to swap queens early and rooks late in the game, and then protect and advance an extra Pawn during the endgame. Then a Knight comes in very handy because of its ability to jump, or a Bishop because of its ability to control diagonals across the board. I also use the King pretty aggressively when advancing the Pawn.
"And do not curse those who call on other than GOD, lest they blaspheme and curse GOD, out of ignorance. We have adorned the works of every group in their eyes. Ultimately, they return to their Lord, then He informs them of everything they had done." (Qur'an 6:108)