head to head
Neither is simply harder - they are hard in different places. Spy vs Spy demands more execution; Throne of Lies: Medieval Politics demands more reads.

Reads · Pure Mind Games
A split-screen trap duel testing prediction of where your human rival hid the bombs.

Reads · Pure Mind Games
A social-deduction game about reading and deceiving adapting human players.
Spy vs Spy leans Reads (Pure Mind Games); Throne of Lies: Medieval Politics leans Reads (Pure Mind Games).
Spy vs Spy leans clearly harder on execution.
Spy vs Spy
Simple movement and item fiddling under time pressure
Throne of Lies: Medieval Politics
No dexterity; voting and chatting decide outcomes
Throne of Lies: Medieval Politics leans clearly harder on reads.
Spy vs Spy
Guessing where the rival spy laid traps is the core duel
Throne of Lies: Medieval Politics
Reading and deceiving adapting human players is the entire game
Throne of Lies: Medieval Politics leans a little harder on variance, though the gap is small.
Spy vs Spy
Item locations are hidden information each round
Throne of Lies: Medieval Politics
Hidden role assignment injects strong concealed information
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Spy vs Spy
Trap-and-counter knowledge forms a learnable layer
Throne of Lies: Medieval Politics
Knowing role abilities and voting math gives an edge
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.