head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Competitive PvP
Vehicular arena duels of handling and aim against human drivers.

Execution · Competitive PvP
A military shooter testing aim with moderate prediction of human opponents online.
Hardware: Rivals leans Execution (Competitive PvP); Medal of Honor: Warfighter leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Hardware: Rivals
Vehicle handling and turret aim decide most duels
Medal of Honor: Warfighter
Gunfights reward aim in both campaign and multiplayer
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Hardware: Rivals
Human opponents' arena rotations reward some prediction
Medal of Honor: Warfighter
Human opponents in multiplayer demand positional prediction
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Hardware: Rivals
Pickup spawns add mild positional randomness
Medal of Honor: Warfighter
Spawns and engagements add modest unpredictability
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Hardware: Rivals
Weapon-pickup control and map knowledge underpin wins
Medal of Honor: Warfighter
Class loadouts and map knowledge form a thin layer
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.