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

Execution · Practiced Mastery
Precision car control of vintage machinery refined through setup and line study.

Execution · Practiced Mastery
A story-driven skateboarding game still won by trick execution.
GT Legends leans Execution (Practiced Mastery); Tony Hawk's Underground 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.
GT Legends
Historic cars without aids demand precise car control every corner
Tony Hawk's Underground
Combos plus off-board tricks keep the input ceiling high
GT Legends leans a little harder on reads, though the gap is small.
GT Legends
Racecraft versus humans exists but pace dominates
Tony Hawk's Underground
Story missions are scripted, not adaptive
GT Legends leans a little harder on variance, though the gap is small.
GT Legends
Conditions are known before the green flag
Tony Hawk's Underground
Fixed levels and mission scripts
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
GT Legends
Setup tuning and line study are where lap time lives
Tony Hawk's Underground
Mission and score-line routing remain solvable
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.