When it comes to arcade games, some developers had a consistent approach to this and others didn't seem to care. Why would they? It's impossible to do simultaneous opposites with standard arcade controls. Therefore I'm not going to bother listing arcade games unless there's some exploit or other noteworthy consequence. I don't know much about such exploits (only remember the DonPachi Type B one) so if anyone has anything to add on that front, arcade or not, it'd be welcome.
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Directions with priority
Game Down Up Right Left
Alltynex Second y * * (L+R is Up)
Blue Revolver y y
Crimzon Clover WEX y y
DNH/danmakufu games ? ? ? ? (could be anything)
Eschatos y y
IKUSAAAAAAAN! y y
Klorets * * * * (most recent direction)
Leiria -Stargazer- y y
Len'en games y y
Noiz2sa y y
Parsec47 y y
rRootage y y
SideLine y y
Sisters Royale y y
Sophstar y y
STG Builder games y y
Suwapyon y y
Tumiki Fighters y y
x.x games up to BWR y y
TH02: Opposing directions cancel each other, but pressing a diagonal while arrested will override it.
TH03/04/05: Most recent direction takes priority, including cardinals overriding diagonals. (Unironically the best control scheme of all?)
TH06/07: Up and Right take priority. Opposing diagonals produce Up-Right.
TH08 onward: Down and Left take priority, except during diagonals, where Up takes priority. Opposing diagonals produce Up-Left. (?????)
Confirmed games where simultaneous opposites cancel each other out:
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Aero Chimera
Blue Wish Desire (3 or more directions produces Up-Left > Down-Left)
CAVE CV1K ports (via xinput d-pad emulation, opposites arrest ALL movement)
Cho Ren Sha 68k
Dead End City
Eden's Aegis (3 or more directions produces Up-Left > Down-Left)
Fire Lancer
Flame Zapper Kotsujin
G-Darius HD
G-wangeDash (opposites arrest ALL movement)
Gunvein
Hazelnut Hex
Hellsinker
Judgement Silversword
Kamui
Psyvariar Delta
RefleX
ring^-27
Shikigami no Shiro 2
Shmup Creator games
StellaVanity (opposites arrest ALL movement)
Torus Trooper
TranscendPang (pseudo-Right, undetermined if it's only visual or not)
Xeno Fighters R
ZeroRanger