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
Capcom's infamously punishing arcade platformer that makes you beat it twice for the real ending.

Execution · Practiced Mastery
Arcade shmup famous for its bullet-reflect barrier and scores running into the quintillions.
Ghosts 'n Goblins leans Execution (Pure Mechanics); Giga Wing leans Execution (Practiced Mastery).
Ghosts 'n Goblins leans a little harder on execution, though the gap is small.
Ghosts 'n Goblins
Committed jumps and pixel-precise throws, no mercy
Giga Wing
Reflect-timing and dodging under heavy fire
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Ghosts 'n Goblins
Enemy spawns are scripted
Giga Wing
Scripted waves with no adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Ghosts 'n Goblins
Red Arremer movement adds slight noise
Giga Wing
Deterministic patterns around the reflect mechanic
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Ghosts 'n Goblins
Weapon choice and route memorisation are mandatory
Giga Wing
Reflect-force timing and medal routes set astronomical scores
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.