head to head
Neither is simply harder - they are hard in different places. Bunch of Heroes demands more execution; The Witcher 3: Wild Hunt demands more optimization.

Execution · Practiced Mastery
A top-down co-op shooter testing aim and survival against alien swarms.

Optimization · Practiced Mastery
A narrative action RPG where build planning matters more than reflex execution.
Bunch of Heroes leans Execution (Practiced Mastery); The Witcher 3: Wild Hunt leans Optimization (Practiced Mastery).
Bunch of Heroes leans clearly harder on execution.
Bunch of Heroes
Twin-stick aiming and dodging swarms is the core
The Witcher 3: Wild Hunt
Combat timing matters but generous dodges forgive sloppy play.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Bunch of Heroes
Enemies swarm on scripted AI, no adaptation
The Witcher 3: Wild Hunt
Enemies use fixed AI behaviours; no adaptation.
Bunch of Heroes leans a little harder on variance, though the gap is small.
Bunch of Heroes
Enemy spawns and waves add some randomness
The Witcher 3: Wild Hunt
Loot rolls and minor combat variance only.
The Witcher 3: Wild Hunt leans clearly harder on optimization.
Bunch of Heroes
Upgrade and co-op positioning choices matter lightly
The Witcher 3: Wild Hunt
Builds, alchemy, and quest routing reward planning.
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.