head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Reads · Competitive PvP
A 3D arena fighter where extendable-arm punches curve mid-flight in PvP duels.

Execution · Competitive PvP
An anime fighter testing combo execution and counter-baiting against human opponents.
ARMS leans Reads (Competitive PvP); Dragon Ball Z: Budokai 3 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.
ARMS
Curving punches and dodge timing
Dragon Ball Z: Budokai 3
Combo execution, teleport counters and beam timing demand hands
ARMS leans a little harder on reads, though the gap is small.
ARMS
Whiff-punish games against adapting humans
Dragon Ball Z: Budokai 3
Versus humans, baiting teleports and guessing cancels decides exchanges
ARMS leans a little harder on variance, though the gap is small.
ARMS
Minor stage and item randomness
Dragon Ball Z: Budokai 3
Almost nothing random beyond minor clash inputs
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
ARMS
Arm loadout counters and matchup study
Dragon Ball Z: Budokai 3
Capsule builds and matchup knowledge underpin competitive play
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.