head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Grand Arena
Build-fight battle royale with deep mechanics.

Execution · Competitive PvP
Aim duels against humans under loot randomness and extraction pressure.
Fortnite leans Execution (Grand Arena); Off The Grid leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Fortnite
Build-edit-aim combos punish slow hands
Off The Grid
Gunfights reward aim and movement above all
Fortnite leans a little harder on reads, though the gap is small.
Fortnite
Box fights are pure adaptive mind games
Off The Grid
Predicting human rotations, ambushes and extraction timing matters constantly
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Fortnite
Loot drops, storm, item rotations vary
Off The Grid
Loot rolls, drops and encounter locations randomise runs
Fortnite leans a little harder on optimization, though the gap is small.
Fortnite
Loadouts, mats economy, rotations solvable
Off The Grid
Cyberlimb loadouts and map economy are learnable systems
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.