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

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

Execution · Pure Mechanics
An arcade-style soccer simulation with licensed national teams.
Halo: Combat Evolved leans Execution (Practiced Mastery); World Tour Soccer 2002 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
World Tour Soccer 2002
player control, passing and shooting precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Halo: Combat Evolved
Multiplayer duels reward reading humans
World Tour Soccer 2002
opponent play in human matches adds reads
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
World Tour Soccer 2002
minor bounce/ref randomness
Halo: Combat Evolved leans a little harder on optimization, though the gap is small.
Halo: Combat Evolved
Weapon sandbox knowledge and encounter routing
World Tour Soccer 2002
tactics and formation choices solvable
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.