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
High-speed cyborg slasher built on precise parries and slicing anything in half.

Execution · Practiced Mastery
An over-the-top horde shooter throwing hundreds of charging enemies at you.
Metal Gear Rising: Revengeance leans Execution (Practiced Mastery); Serious Sam: The Second Encounter leans Execution (Practiced Mastery).
Metal Gear Rising: Revengeance leans a little harder on execution, though the gap is small.
Metal Gear Rising: Revengeance
parry timing and blade-mode cuts demand sharp reactions
Serious Sam: The Second Encounter
Circle-strafing huge horde waves tests stamina and aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Metal Gear Rising: Revengeance
bosses telegraph fixed patterns
Serious Sam: The Second Encounter
Enemies charge in fixed patterns
Serious Sam: The Second Encounter leans a little harder on variance, though the gap is small.
Metal Gear Rising: Revengeance
deterministic encounters
Serious Sam: The Second Encounter
Wave compositions memorised after one run
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Metal Gear Rising: Revengeance
learning movesets and upgrade priorities
Serious Sam: The Second Encounter
Prioritising targets and managing arenas is solvable
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.