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
A vertical-scrolling bullet-hell shoot-em-up.

Execution · Pure Mechanics
Peak 16-bit run-and-gun of set-piece bosses and razor-thin dodges.
Bullet Soul leans Execution (Pure Mechanics); Contra III: The Alien Wars 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.
Bullet Soul
dense bullet dodging demands precise reflexes
Contra III: The Alien Wars
Relentless bosses and bullet dodging
Bullet Soul leans a little harder on reads, though the gap is small.
Bullet Soul
bullet patterns fixed, not adaptive
Contra III: The Alien Wars
Set-piece bosses are pure scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Bullet Soul
minimal pattern randomness
Contra III: The Alien Wars
Everything is fixed and learnable
Contra III: The Alien Wars leans a little harder on optimization, though the gap is small.
Bullet Soul
pattern memorization for scoring runs
Contra III: The Alien Wars
Weapon management and pattern memorization
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.