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.

Reads · Competitive PvP
Anime arena fighter where managing the substitution gauge is the real duel.

Execution · Competitive PvP
Grapple timing and reversal prediction against human opponents in the ring.
Naruto Shippuden: Ultimate Ninja Storm 4 leans Reads (Competitive PvP); WWF War Zone leans Execution (Competitive PvP).
WWF War Zone leans a little harder on execution, though the gap is small.
Naruto Shippuden: Ultimate Ninja Storm 4
Simple inputs; movement and substitution timing matter
WWF War Zone
Move inputs and reversal timing decide exchanges
Naruto Shippuden: Ultimate Ninja Storm 4 leans a little harder on reads, though the gap is small.
Naruto Shippuden: Ultimate Ninja Storm 4
Versus humans, baiting substitutions is the core game
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.
Naruto Shippuden: Ultimate Ninja Storm 4
Minor support-assist chaos
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.
Naruto Shippuden: Ultimate Ninja Storm 4
Team composition and matchup knowledge
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.