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
An anime fighting game testing execution and prediction against human opponents.
Naruto Shippuden: Ultimate Ninja Storm 4 leans Reads (Competitive PvP); Yu Yu Hakusho: Ghost Files - Dark Tournament leans Execution (Competitive PvP).
Yu Yu Hakusho: Ghost Files - Dark Tournament leans a little harder on execution, though the gap is small.
Naruto Shippuden: Ultimate Ninja Storm 4
Simple inputs; movement and substitution timing matter
Yu Yu Hakusho: Ghost Files - Dark Tournament
Combo timing and spacing matter in fast 2D fights
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Naruto Shippuden: Ultimate Ninja Storm 4
Versus humans, baiting substitutions is the core game
Yu Yu Hakusho: Ghost Files - Dark Tournament
Human versus opponents drives prediction of attacks and blocks
Yu Yu Hakusho: Ghost Files - Dark Tournament leans a little harder on variance, though the gap is small.
Naruto Shippuden: Ultimate Ninja Storm 4
Minor support-assist chaos
Yu Yu Hakusho: Ghost Files - Dark Tournament
Some card-mode RNG and matchup chaos
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
Yu Yu Hakusho: Ghost Files - Dark Tournament
Character movesets and matchups reward study
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.
full breakdown
Naruto Shippuden: Ultimate Ninja Storm 4 →
full breakdown
Yu Yu Hakusho: Ghost Files - Dark Tournament →