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

Execution · Competitive PvP
Tests arena-shooter aim and map-control prediction against human lobbies.

Execution · Competitive PvP
Stick precision and constant prediction of a human opponent's tactical habits.
Halo 2: Anniversary leans Execution (Competitive PvP); Pro Evolution Soccer 2015 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.
Halo 2: Anniversary
Aim, grenades and movement decide every multiplayer duel
Pro Evolution Soccer 2015
First touch, through-ball timing and finishing demand precise sticks
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Halo 2: Anniversary
Predicting human positioning and power-weapon pushes is constant
Pro Evolution Soccer 2015
Human opponents bait, switch tactics and punish habits
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Halo 2: Anniversary
Static spawns and timers leave little true randomness
Pro Evolution Soccer 2015
Deflections and referee calls add bounded chaos
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Halo 2: Anniversary
Weapon timers, map control and campaign routes are learnable systems
Pro Evolution Soccer 2015
Formations, player roles and set pieces reward study
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.