The high-value stance. An army that intends to win by controlling the few positions that decide the game.
Your Force Disposition comes out of the detachments you take when you build the army, so it is settled before the game begins — and it fixes which five primary missions you can ever be dealt.
Priority Assets is the disposition on 24.2% of recorded tournament lists (1,965 lists).
Adeptus Mechanicus reaches for it most, on 68.3% of its lists, then Thousand Sons at 54.3%.