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

Execution · Practiced Mastery
A soccer game testing on-ball execution and tactical opponent prediction.

Execution · Practiced Mastery
The sequel adding Horde mode to the campaign-plus-versus cover shooter formula.
ESPN MLS ExtraTime 2002 leans Execution (Practiced Mastery); Gears of War 2 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.
ESPN MLS ExtraTime 2002
Passing, shooting and dribbling timing carry play
Gears of War 2
Gnasher battles and movement tech set the ceiling
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
ESPN MLS ExtraTime 2002
Predicting human opponents' positioning and passes matters
Gears of War 2
Human opponents in versus drive prediction play
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
ESPN MLS ExtraTime 2002
Minor deflection and bounce randomness
Gears of War 2
Horde spawns add mild randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
ESPN MLS ExtraTime 2002
Formations, set pieces and tactics are learnable
Gears of War 2
Power-weapon timing and positioning are 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.