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
Football stick execution and opponent reading, salted with bounce-of-the-ball luck.

Execution · Competitive PvP
Timing-based reversal duels with human mind-games layered on wrestling systems.
FIFA Soccer 07 leans Execution (Competitive PvP); WWE '13 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.
FIFA Soccer 07
Stick skills and timing on passes and finishing
WWE '13
Reversal windows and move timing decide exchanges
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Soccer 07
Versus humans, baiting tackles and disguising attacks matters
WWE '13
Human opponents vary timing to bait reversals
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Soccer 07
Deflections and keeper randomness swing single matches
WWE '13
Kick-out rolls and momentum swings add scripted chaos
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Soccer 07
Formations and exploit patterns are learnable meta
WWE '13
Knowing move-sets and match-type systems pays off
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.