head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, 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 arena blaster testing sustained dodging reflexes and upgrade picks.
Broforce leans Execution (Pure Mechanics); Ultratron leans Execution (Pure Mechanics).
Ultratron leans a little harder on execution, though the gap is small.
Broforce
Run-and-gun reflexes amid constant explosions
Ultratron
Twin-stick dodging through bullet swarms is the entire test
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
Ultratron
Robots swarm in fixed behaviours, nothing adapts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Broforce
Random bro assignments and destructible chaos shake runs
Ultratron
Enemy spawns and power-up drops shuffle each level
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
Ultratron
Upgrade pet-and-perk choices shape survivability
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.