head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is optimization, and it is a single point.

Execution · Pure Mechanics
Retro arcade racer channeling Top Gear's pure lane-weaving speed.

Execution · Practiced Mastery
A classic arcade brawler sending the turtles through time to pummel Foot Clan waves.
Horizon Chase Turbo leans Execution (Pure Mechanics); Teenage Mutant Ninja Turtles IV: Turtles in Time 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.
Horizon Chase Turbo
Weaving through traffic and nailing fuel pickups
Teenage Mutant Ninja Turtles IV: Turtles in Time
Throw timing, positioning, and boss dodges are the whole test.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Horizon Chase Turbo
Rival cars run fixed rubber-band logic
Teenage Mutant Ninja Turtles IV: Turtles in Time
Foot Soldiers run fixed scripts.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Horizon Chase Turbo
Minimal randomness in track layouts
Teenage Mutant Ninja Turtles IV: Turtles in Time
Stages and waves are essentially fixed.
Teenage Mutant Ninja Turtles IV: Turtles in Time leans a little harder on optimization, though the gap is small.
Horizon Chase Turbo
Car stats and lap memorization help
Teenage Mutant Ninja Turtles IV: Turtles in Time
Wave layouts and boss patterns are fully memorisable.
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.