Which minor pieces is best for the end game?


Silman agrees with DurTeeDan:
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(p. 16)
RULE 9--Knights are superior to Bishops in an
endgame if all the pawns are on one side of the
board. This is because the Bishop's long-range
powers no longer have meaning while the Knight's
ability to go to either color square means that there
is no safe haven for the enemy King or pawns.
Silman, Jeremy. 1999. The Amateur's Mind: Turning Chess Misconceptions into Chess Mastery, 2nd Edition/Expanded. Los Angeles, CA: Siles Press.
Hi there.
I've been struggling with the choice of which minor piece or pieces is best fo the end game. In my mind I believe that a single Knight is better in the end game than a single bishop. But 2 bishops are better against a single Knight.
Keeping a knight means you can still be a threat to any piece where a single bishop can only attack on it's own coloured square. Two bishops mean you can still juggle them around and be a threat to both coloured squares.
What is the general concensus to which peices to try and keep?