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
A soccer game testing on-pitch execution and outplaying opponents.

Execution · Competitive PvP
Reversal timing and pacing against an opponent baiting your counters.
This is Football leans Execution (Competitive PvP); WWE 2K15 leans Execution (Competitive PvP).
This is Football leans a little harder on execution, though the gap is small.
This is Football
Passing, shooting, and movement timing drive matches
WWE 2K15
Reversal timing windows decide most exchanges
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
This is Football
Human opponents you outmaneuver; AI is scripted
WWE 2K15
Human opponents bait reversals and vary move timing
This is Football leans a little harder on variance, though the gap is small.
This is Football
Some ball-physics and AI randomness
WWE 2K15
Chain-wrestling rock-paper-scissors minigames add randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
This is Football
Tactics, formations, and squad management matter
WWE 2K15
Move sets, stamina and match pacing 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.