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 · Practiced Mastery
Toy-car arcade racer about drift-charging boost on loop-the-loop tracks.

Execution · Practiced Mastery
Open-world racing MMO spanning a condensed United States.
Hot Wheels Unleashed leans Execution (Practiced Mastery); The Crew leans Execution (Practiced Mastery).
Hot Wheels Unleashed leans a little harder on execution, though the gap is small.
Hot Wheels Unleashed
Drift-boost management on twisting plastic tracks
The Crew
car control across long cross-country races
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Hot Wheels Unleashed
Online races add light human jockeying
The Crew
PvP races involve mild positional mind games
The Crew leans a little harder on variance, though the gap is small.
Hot Wheels Unleashed
Car unboxing randomness outside races
The Crew
traffic and open-world events add noise
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Hot Wheels Unleashed
Car tiers, upgrades, and racing lines
The Crew
car specs and route choice are tunable
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.