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
The pioneering ninja stealth game of rooftop grappling and one-strike assassinations in feudal Japan.

Optimization · Pure Optimization
Definitive top-down Zelda spanning light and dark mirrored worlds.
Tenchu: Stealth Assassins leans Optimization (Practiced Mastery); The Legend of Zelda: A Link to the Past leans Optimization (Pure Optimization).
Tenchu: Stealth Assassins leans a little harder on execution, though the gap is small.
Tenchu: Stealth Assassins
Grapple movement and stealth-kill timing
The Legend of Zelda: A Link to the Past
Responsive combat and boss dodging, moderate demand
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Tenchu: Stealth Assassins
Guards patrol on fixed routes
The Legend of Zelda: A Link to the Past
All enemies scripted
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Tenchu: Stealth Assassins
Item drops and unseen layouts first run
The Legend of Zelda: A Link to the Past
Secrets unknown until found
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Tenchu: Stealth Assassins
Guard routes and Grand Master paths solvable
The Legend of Zelda: A Link to the Past
Two-world puzzle structure and item-driven routing
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.