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

Execution · Competitive PvP
Striking execution and constant human mix-up prediction across MMA phases.
ARMS leans Reads (Competitive PvP); EA Sports UFC 5 leans Execution (Competitive PvP).
EA Sports UFC 5 leans a little harder on execution, though the gap is small.
ARMS
Curving punches and dodge timing
EA Sports UFC 5
Strike timing, head movement and transition denial demand hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
ARMS
Whiff-punish games against adapting humans
EA Sports UFC 5
Out-guessing a human's strike-grapple mix is the core duel
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
ARMS
Minor stage and item randomness
EA Sports UFC 5
Damage events and doctor stoppages add chaos
EA Sports UFC 5 leans a little harder on optimization, though the gap is small.
ARMS
Arm loadout counters and matchup study
EA Sports UFC 5
Stamina math and matchup study underpin the meta
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.