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
Execution on the ball plus constant prediction of the other player's shape.

Execution · Competitive PvP
Grapple timing and reversal prediction against human opponents in the ring.
Pro Evolution Soccer 2009 leans Execution (Competitive PvP); WWF War Zone 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 2009
Close control and finishing windows demand stick precision
WWF War Zone
Move inputs and reversal timing decide exchanges
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Pro Evolution Soccer 2009
Online and couch opponents adjust tactics against you
WWF War Zone
Human opponents bait grapples and reversals constantly
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Pro Evolution Soccer 2009
Ricochets and keeper parries add small randomness
WWF War Zone
Minor hit randomness in grapple trades
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Pro Evolution Soccer 2009
Squad setup and tactical sliders reward preparation
WWF War Zone
Learning each wrestler's movelist and counters is the homework
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.