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

Execution · Competitive PvP
Stick precision and constant prediction of a human opponent's tactical habits.

Execution · Grand Arena
A classic football simulation with tactical team management.
Pro Evolution Soccer 2015 leans Execution (Competitive PvP); Winning Eleven: Pro Evolution Soccer 2007 leans Execution (Grand Arena).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Pro Evolution Soccer 2015
First touch, through-ball timing and finishing demand precise sticks
Winning Eleven: Pro Evolution Soccer 2007
passing/shooting timing needs real precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Pro Evolution Soccer 2015
Human opponents bait, switch tactics and punish habits
Winning Eleven: Pro Evolution Soccer 2007
human opponents adapt tactics against you
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Pro Evolution Soccer 2015
Deflections and referee calls add bounded chaos
Winning Eleven: Pro Evolution Soccer 2007
minor ball-physics randomness
Winning Eleven: Pro Evolution Soccer 2007 leans a little harder on optimization, though the gap is small.
Pro Evolution Soccer 2015
Formations, player roles and set pieces reward study
Winning Eleven: Pro Evolution Soccer 2007
tactics and formations are learnable systems
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.