head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
Pattern memorisation and precise platforming with a solvable boss-order route.

Execution · Practiced Mastery
Executing memorised high-speed routes through deterministic platforming levels.
Mega Man 5 leans Execution (Practiced Mastery); Sonic Generations leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Mega Man 5
Precise jumps and buster timing through gauntlet stages
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.
Mega Man 5
Robot Masters cycle fixed attack patterns
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.
Mega Man 5
Every stage and boss is identical each attempt
Sonic Generations
Levels are fully deterministic
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Mega Man 5
Weapon-order routing and pattern memorisation solve the game
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.