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

Execution · Competitive PvP
The peak-era Konami football game prized for weighty, skill-driven match play.

Execution · Competitive PvP
Hardcore Eastern Front shooter where exposure for seconds means death.
Pro Evolution Soccer 6 leans Execution (Competitive PvP); Red Orchestra 2: Heroes of Stalingrad 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.
Pro Evolution Soccer 6
First touch, through balls, and dribbles demand precise control
Red Orchestra 2: Heroes of Stalingrad
Realistic ballistics and one-shot kills demand precise aim.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Pro Evolution Soccer 6
Versus matches are constant feint and positioning prediction
Red Orchestra 2: Heroes of Stalingrad
Anticipating human teams' pushes and covered angles.
Red Orchestra 2: Heroes of Stalingrad leans a little harder on variance, though the gap is small.
Pro Evolution Soccer 6
Deflections and keeper spills add light randomness
Red Orchestra 2: Heroes of Stalingrad
Suppression, concealment, and unseen shooters.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Pro Evolution Soccer 6
Formations and player roles are studyable
Red Orchestra 2: Heroes of Stalingrad
Map chokepoints and role mechanics 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.