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
Sonic alternates breakneck daytime boost stages with brawling night levels as the Werehog.

Execution · Practiced Mastery
Retro ninja platformer that flips from linear levels into a time-hopping metroidvania.
Sonic Unleashed leans Execution (Practiced Mastery); The Messenger 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.
Sonic Unleashed
Daytime boost stages demand reaction-speed precision
The Messenger
cloudstep chains demand precise aerial control
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Sonic Unleashed
Scripted enemies in both forms
The Messenger
enemies and bosses are fully scripted
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Sonic Unleashed
First-run stage hazards arrive fast and unseen
The Messenger
deterministic level design
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Sonic Unleashed
S-rank routes and Werehog combat upgrades are solvable
The Messenger
upgrade economy and late-game route knowledge
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.