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 · Pure Mechanics
Memorising punishing fixed stages and executing precise run-and-gun inputs.

Execution · Practiced Mastery
Executing memorised high-speed routes through deterministic platforming levels.
Journey to Silius leans Execution (Pure Mechanics); Sonic Generations leans Execution (Practiced Mastery).
Journey to Silius leans a little harder on execution, though the gap is small.
Journey to Silius
Precise jumps and dodges under NES-hard pressure define it
Sonic Generations
Holding speed through precise jumps and boosts is the test
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Journey to Silius
Every enemy and boss is rigidly scripted
Sonic Generations
No opponent; bosses are fixed patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Journey to Silius
Identical layouts and spawns every attempt
Sonic Generations
Levels are fully deterministic
Sonic Generations leans a little harder on optimization, though the gap is small.
Journey to Silius
Weapon-energy budgeting and pattern memorisation make clears possible
Sonic Generations
S-ranks come from memorising optimal routes and shortcuts
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.