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 · Competitive PvP
A hero battle royale where teamwork and aim against human opponents decides fights.
Gears 5 leans Execution (Practiced Mastery); My Hero Ultra Rumble 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.
Gears 5
Movement tech and shotgun duels remain the core test
My Hero Ultra Rumble
aim and combo timing in battles
My Hero Ultra Rumble leans a little harder on reads, though the gap is small.
Gears 5
Ranked versus rewards out-thinking human opponents
My Hero Ultra Rumble
predicting human opponent tactics
My Hero Ultra Rumble leans a little harder on variance, though the gap is small.
Gears 5
Escape and Horde inject some run variance
My Hero Ultra Rumble
item and loot drops are random
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
My Hero Ultra Rumble
team comps and loadouts 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.