head to head
Neither is simply harder - they are hard in different places. StarCraft II: Wings of Liberty demands more optimization; Z1 Battle Royale demands more variance.

Execution · Grand Arena
Real-time strategy where hands, reads, and build optimization all matter at the top.

Execution · Grand Arena
An early battle royale shooter where dozens of players loot, drive, and shoot to be the last one standing.
StarCraft II: Wings of Liberty leans Execution (Grand Arena); Z1 Battle Royale leans Execution (Grand Arena).
StarCraft II: Wings of Liberty leans clearly harder on execution.
StarCraft II: Wings of Liberty
APM, macro, micro-control under pressure
Z1 Battle Royale
Gunplay, bullet drop, and car control under pressure
StarCraft II: Wings of Liberty leans clearly harder on reads.
StarCraft II: Wings of Liberty
1v1 ladder vs adaptive humans modeling you
Z1 Battle Royale
Human opponents rotate, bait, and adapt to you
Z1 Battle Royale leans clearly harder on variance.
StarCraft II: Wings of Liberty
map spawns minor; mostly known
Z1 Battle Royale
Loot spawns, drop locations, and gas circles
StarCraft II: Wings of Liberty leans clearly harder on optimization.
StarCraft II: Wings of Liberty
build orders, economy curves heavily solved
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.