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
Crisp NES licensed platformer about chipmunks hurling crates at robots.

Execution · Practiced Mastery
A blistering DS Sonic built around the boost gauge, introducing Blaze the Cat.
Chip 'n Dale Rescue Rangers leans Execution (Practiced Mastery); Sonic Rush 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.
Chip 'n Dale Rescue Rangers
Tight jumps and box-throw timing
Sonic Rush
Boost management and trick timing at high speed
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Chip 'n Dale Rescue Rangers
Enemies are simple fixed patterns
Sonic Rush
Scripted bosses only
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Chip 'n Dale Rescue Rangers
Deterministic levels
Sonic Rush
Dual-screen layouts surprise on first runs
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Chip 'n Dale Rescue Rangers
Level memory and boss pattern knowledge
Sonic Rush
Rank grinding turns levels into solved boost routes
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.