head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Practiced Mastery
The console FPS landmark that introduced Master Chief and the ring world.

Execution · Pure Mechanics
A late-90s mercenary FPS infamous for its graphic locational damage system.
Halo: Combat Evolved leans Execution (Practiced Mastery); Soldier of Fortune leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Halo: Combat Evolved
Aim, grenade timing, and vehicle control
Soldier of Fortune
Fast twitch aim against fragile enemies decides everything
Halo: Combat Evolved leans a little harder on reads, though the gap is small.
Halo: Combat Evolved
Multiplayer duels reward reading humans
Soldier of Fortune
Multiplayer duels add a little human prediction
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Halo: Combat Evolved
Covenant AI varies tactics slightly
Soldier of Fortune
Campaign layouts and spawns are fixed
Halo: Combat Evolved leans a little harder on optimization, though the gap is small.
Halo: Combat Evolved
Weapon sandbox knowledge and encounter routing
Soldier of Fortune
Weapon choice and level routes are quickly learned
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.