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 · Practiced Mastery
An over-the-top horde shooter throwing hundreds of charging enemies at you.

Execution · Practiced Mastery
A sword-and-gun action shooter rewarding combo timing mastery and careful upgrade investment against scripted demon hordes.
Serious Sam: The Second Encounter leans Execution (Practiced Mastery); Shadow Warrior (2013) leans Execution (Practiced Mastery).
Shadow Warrior (2013) leans a little harder on execution, though the gap is small.
Serious Sam: The Second Encounter
Circle-strafing huge horde waves tests stamina and aim
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.
Serious Sam: The Second Encounter
Enemies charge in fixed patterns
Shadow Warrior (2013)
All enemies are scripted demons with fixed attack patterns
Shadow Warrior (2013) leans a little harder on variance, though the gap is small.
Serious Sam: The Second Encounter
Wave compositions memorised after one run
Shadow Warrior (2013)
Upgrade drop randomness introduces mild run-to-run variance
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Serious Sam: The Second Encounter
Prioritising targets and managing arenas is solvable
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.