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 · Practiced Mastery
A basic arcade soccer game testing input timing and simple positioning.

Execution · Competitive PvP
Reversal-timing duels where humans bait each other inside scripted spectacle.
Champions World Class Soccer leans Execution (Practiced Mastery); WWE SmackDown vs. Raw 2011 leans Execution (Competitive PvP).
Champions World Class Soccer leans a little harder on execution, though the gap is small.
Champions World Class Soccer
Passing, shooting and tackling timing carry every play
WWE SmackDown vs. Raw 2011
Reversal timing windows reward practiced reactions
WWE SmackDown vs. Raw 2011 leans a little harder on reads, though the gap is small.
Champions World Class Soccer
Two-player mode lets you predict a human opponent
WWE SmackDown vs. Raw 2011
Versus humans, reversal baiting becomes a guessing duel
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Champions World Class Soccer
Little randomness once team ratings are known
WWE SmackDown vs. Raw 2011
Momentum swings and AI quirks add mild chaos
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Champions World Class Soccer
Formation choice and team selection give a known edge
WWE SmackDown vs. Raw 2011
Move sets, match types and creation systems are learnable
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.