Don't you get better authority with twin rudders in the event of an engine failure (on a two-engined aircraft of course)?
And if I recall correctly the original F-117 (Have Blue?) had *inward* canted fins, but both crash and the design was changed to the familiar outward canted design. Wonder what they would have looked like... *goes off to google*
Yep, right i was.
From
F-117 Reunion