head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is optimization, 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
Early battle royale where scavenged loot and shrinking gas decide 150-player brawls.
ARC Raiders leans Execution (Grand Arena); H1Z1 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.
ARC Raiders
Gunplay and movement under machine fire
H1Z1
Gunfights and vehicle control decide duels
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
H1Z1
Outguessing human rotations and pushes
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
H1Z1
Loot spawns and gas circles randomise runs
ARC Raiders leans a little harder on optimization, though the gap is small.
ARC Raiders
Loadout economy and map knowledge compound
H1Z1
Drop spots, loot routes, and zone play
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.