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

Execution · Competitive PvP
Play-calling mind games against a human layered over stick execution and roster planning.

Execution · Competitive PvP
Stick precision and constant prediction of a human opponent's tactical habits.
All-Pro Football 2K8 leans Execution (Competitive PvP); Pro Evolution Soccer 2015 leans Execution (Competitive PvP).
Pro Evolution Soccer 2015 leans a little harder on execution, though the gap is small.
All-Pro Football 2K8
Stick skills on passes, jukes and tackles decide individual plays
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.
All-Pro Football 2K8
Play-calling against a human is a genuine prediction duel
Pro Evolution Soccer 2015
Human opponents bait, switch tactics and punish habits
All-Pro Football 2K8 leans a little harder on variance, though the gap is small.
All-Pro Football 2K8
Catches, fumbles and matchup rolls add per-play noise
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.
All-Pro Football 2K8
Roster construction and playbook knowledge set the floor
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.