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
Battle royale survival blending aim, rotation planning, and heavy circle-and-loot RNG.

Execution · Grand Arena
Gunfight execution and human prediction under randomised loot and storms.
PUBG Mobile 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.
PUBG Mobile
Touchscreen aim and recoil control set the ceiling
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.
PUBG Mobile
Outguessing rotations and third-party timing of human squads
Ring of Elysium
Outguessing human rotations and pushes is constant
PUBG Mobile leans a little harder on variance, though the gap is small.
PUBG Mobile
Circle placement, loot and drop locations dominate single matches
Ring of Elysium
Loot spawns and storm path randomise every match
PUBG Mobile leans a little harder on optimization, though the gap is small.
PUBG Mobile
Zone rotation theory and loadout priorities are well mapped
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.