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 · Pure Mechanics
Brutal one-hit-death shmup execution over patterns that must be memorised to survive.
Metal Gear Rising: Revengeance leans Execution (Practiced Mastery); Silver Surfer leans Execution (Pure Mechanics).
Silver Surfer leans a little harder on execution, though the gap is small.
Metal Gear Rising: Revengeance
parry timing and blade-mode cuts demand sharp reactions
Silver Surfer
One-hit deaths demand near-perfect dodging every second
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
Silver Surfer
Enemy waves are fully scripted patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Metal Gear Rising: Revengeance
deterministic encounters
Silver Surfer
Stages replay identically once learned
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
Silver Surfer
Memorising spawn patterns and safe lines is mandatory study
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.