head to head
Fortnite asks more than Ready or Not, and the gap is reads.

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

Execution · Pure Mechanics
Tactical SWAT shooter with lethal TTK.
Fortnite leans Execution (Grand Arena); Ready or Not leans Execution (Pure Mechanics).
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
Ready or Not
Lethal TTK and recoil punish slop
Fortnite leans clearly harder on reads.
Fortnite
Box fights are pure adaptive mind games
Ready or Not
Mostly scripted suspects, limited reads
Fortnite leans a little harder on variance, though the gap is small.
Fortnite
Loot drops, storm, item rotations vary
Ready or Not
Suspect placement and AI behavior varies
Fortnite leans a little harder on optimization, though the gap is small.
Fortnite
Loadouts, mats economy, rotations solvable
Ready or Not
Loadouts, breaching tools, team plans
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.