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

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

Execution · Pure Mechanics
A top-down war shooter testing dodging and aim through scripted enemy waves.
Broforce leans Execution (Pure Mechanics); Iron Tank: The Invasion of Normandy 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
Iron Tank: The Invasion of Normandy
Dodging fire and aiming under the scrolling assault is constant
Iron Tank: The Invasion of Normandy leans a little harder on reads, though the gap is small.
Broforce
Enemies are dumb scripts
Iron Tank: The Invasion of Normandy
Enemies spawn on fixed scripts, no adaptation
Broforce leans a little harder on variance, though the gap is small.
Broforce
Random bro assignments and destructible chaos shake runs
Iron Tank: The Invasion of Normandy
Some enemy placement surprises but levels are fixed
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
Iron Tank: The Invasion of Normandy
Weapon powerup management and routing help survival
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.