head to head
Ring of Elysium asks more than Ready or Not, and the gap is variance.

Execution · Pure Mechanics
Tactical SWAT shooter with lethal TTK.

Execution · Grand Arena
Gunfight execution and human prediction under randomised loot and storms.
Ready or Not leans Execution (Pure Mechanics); Ring of Elysium leans Execution (Grand Arena).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Ready or Not
Lethal TTK and recoil punish slop
Ring of Elysium
Gunfights are won by aim and movement first
Ring of Elysium leans a little harder on reads, though the gap is small.
Ready or Not
Mostly scripted suspects, limited reads
Ring of Elysium
Outguessing human rotations and pushes is constant
Ring of Elysium leans clearly harder on variance.
Ready or Not
Suspect placement and AI behavior varies
Ring of Elysium
Loot spawns and storm path randomise every match
Ready or Not leans a little harder on optimization, though the gap is small.
Ready or Not
Loadouts, breaching tools, team plans
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.