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.

Optimization · Practiced Mastery
A stealth-action game where planning routes past scripted guards is the deep skill.

Optimization · Practiced Mastery
FPS scenarios converted into solvable sequencing puzzles by stopped time.
Metal Gear Solid 2: Substance leans Optimization (Practiced Mastery); SuperHot leans Optimization (Practiced Mastery).
SuperHot leans a little harder on execution, though the gap is small.
Metal Gear Solid 2: Substance
stealth timing and aim matter
SuperHot
Time-stops-when-you-stop removes most twitch pressure
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Metal Gear Solid 2: Substance
guards are scripted, no adaptation
SuperHot
Red guys follow spawn scripts, not minds
SuperHot leans a little harder on variance, though the gap is small.
Metal Gear Solid 2: Substance
minor patrol randomness
SuperHot
Spawn order is unknown on a first attempt only
SuperHot leans a little harder on optimization, though the gap is small.
Metal Gear Solid 2: Substance
stealth routes and gadgets solvable
SuperHot
Each level is a solvable movement-and-kill-order puzzle
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.