Leaving out the dead folks.... because that would get into a long story about who trained Benedict and the scions of Oberon that everyone has forgotten.
Oberon (no one's trickier)
Eric (holds Amber against external enemies as well as Corwin AND Bleys, fighting as well as Corwin)
Corwin (even better one on one, this style being developed for a couple Earth centuries, as Eric finds out, dirty tricks specialist)
Dierdre (better with social warfare than all the men above, even Oberon)
Bleys (Master of Armies)
Julian (Master of Constructs, monster fighting specialist)
Caine (Fleet Commander, unconventional warfare specialist)
Florimel (political warfare specialist)
Gerard (Fleet Commander, political warfare specialist)
Llewella (exotic environ warfare specialist)
Random (demonstrates enough endurance, strength, and magical talent in the canon that he can't be really tough on warfare)
So we go from several thousand years of a King in Amber who is total Warfare savvy to a King in Amber who is least among his sibs in Warfare.
Across the range of shadow civilizations, we watch the King is a Badass become, the President is the Face of State.