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

Execution · Pure Mechanics
Namco's lavish Galaga sequel adds dimension warps and ship-stacking to classic formation shooting.

Execution · Practiced Mastery
A sword-and-gun action shooter rewarding combo timing mastery and careful upgrade investment against scripted demon hordes.
Galaga '88 leans Execution (Pure Mechanics); Shadow Warrior (2013) leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Galaga '88
Precise dodging and shooting through dense dive patterns.
Shadow Warrior (2013)
Sword combos and gunplay require precise timing and input chaining
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Galaga '88
Aliens attack on choreographed scripts.
Shadow Warrior (2013)
All enemies are scripted demons with fixed attack patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Galaga '88
Dive timing and dimension-warp triggers vary.
Shadow Warrior (2013)
Upgrade drop randomness introduces mild run-to-run variance
Shadow Warrior (2013) leans a little harder on optimization, though the gap is small.
Galaga '88
Triple-ship management and warp routing reward planning.
Shadow Warrior (2013)
Ki power and upgrade tree investment form a meaningful build layer
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.