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

Execution · Pure Mechanics
An explosively destructible run-and-gun starring parody action-movie heroes.

Execution · Pure Mechanics
A twin-stick shooter testing aim and crowd control across zombie waves.
Broforce leans Execution (Pure Mechanics); Zombie Apocalypse 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.
Broforce
Run-and-gun reflexes amid constant explosions
Zombie Apocalypse
Dual-stick aiming and dodging carry the survival
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Broforce
Enemies are dumb scripts
Zombie Apocalypse
Zombies swarm without adapting to you
Zombie Apocalypse leans a little harder on variance, though the gap is small.
Broforce
Random bro assignments and destructible chaos shake runs
Zombie Apocalypse
Spawn waves and hazard timing add chaos
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Broforce
Knowing each bro's kit and level layouts helps
Zombie Apocalypse
Using environmental hazards and weapon choice efficiently
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.