Building comparison
head to head
DayZvsFortnite
Neither is simply harder - they are hard in different places. DayZ demands more variance; Fortnite demands more execution.
DayZ
Variance · Grand Arena
Hardcore survival sandbox where other players are scarier than the zombies.
Fortnite
Execution · Grand Arena
Build-fight battle royale with deep mechanics.
DayZ leans Variance (Grand Arena); Fortnite leans Execution (Grand Arena).
DayZFortnite
Axis by axis
Execution6 vs 8
Fortnite leans clearly harder on execution.
DayZ
gunfights punish slow hands severely
Fortnite
Build-edit-aim combos punish slow hands
Reads6 vs 7
Fortnite leans a little harder on reads, though the gap is small.
DayZ
every survivor met may lie, ambush, or befriend
Fortnite
Box fights are pure adaptive mind games
Variance7 vs 5
DayZ leans clearly harder on variance.
DayZ
loot spawns and who you meet are unknowable
Fortnite
Loot drops, storm, item rotations vary
Optimization5 vs 6
Fortnite leans a little harder on optimization, though the gap is small.
DayZ
map knowledge and survival routines compound
Fortnite
Loadouts, mats economy, rotations solvable
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.