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 · Grand Arena
An extraction shooter where scavengers dodge killer machines and rival squads for loot.

Execution · Grand Arena
Gunfight execution and human prediction under randomised loot and storms.
ARC Raiders leans Execution (Grand Arena); Ring of Elysium leans Execution (Grand Arena).
Ring of Elysium leans a little harder on execution, though the gap is small.
ARC Raiders
Gunplay and movement under machine fire
Ring of Elysium
Gunfights are won by aim and movement first
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
ARC Raiders
Rival squads ambush, bait, and adapt
Ring of Elysium
Outguessing human rotations and pushes is constant
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
ARC Raiders
Loot spawns and unknown player positions
Ring of Elysium
Loot spawns and storm path randomise every match
ARC Raiders leans a little harder on optimization, though the gap is small.
ARC Raiders
Loadout economy and map knowledge compound
Ring of Elysium
Drop routes and rescue-flight positioning reward planning
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.