head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, 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
An early battle royale shooter where dozens of players loot, drive, and shoot to be the last one standing.
PUBG Mobile leans Execution (Grand Arena); Z1 Battle Royale 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.
PUBG Mobile
Touchscreen aim and recoil control set the ceiling
Z1 Battle Royale
Gunplay, bullet drop, and car control under pressure
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
Z1 Battle Royale
Human opponents rotate, bait, and adapt to you
PUBG Mobile leans a little harder on variance, though the gap is small.
PUBG Mobile
Circle placement, loot and drop locations dominate single matches
Z1 Battle Royale
Loot spawns, drop locations, and gas circles
PUBG Mobile leans a little harder on optimization, though the gap is small.
PUBG Mobile
Zone rotation theory and loadout priorities are well mapped
Z1 Battle Royale
Loadout and rotation strategy is a thinner layer
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.