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
A modern Gears entry spanning campaign, Horde, Escape, and ranked versus.

Execution · Practiced Mastery
The console FPS landmark that introduced Master Chief and the ring world.
Gears 5 leans Execution (Practiced Mastery); Halo: Combat Evolved leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Gears 5
Movement tech and shotgun duels remain the core test
Halo: Combat Evolved
Aim, grenade timing, and vehicle control
Gears 5 leans a little harder on reads, though the gap is small.
Gears 5
Ranked versus rewards out-thinking human opponents
Halo: Combat Evolved
Multiplayer duels reward reading humans
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Gears 5
Escape and Horde inject some run variance
Halo: Combat Evolved
Covenant AI varies tactics slightly
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Gears 5
Character ultimates and map control are learnable
Halo: Combat Evolved
Weapon sandbox knowledge and encounter routing
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.