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
A one-hit boss-rush where solving each titan still demands perfect execution.

Execution · Practiced Mastery
A story-driven skateboarding game still won by trick execution.
Titan Souls 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.
Titan Souls
One arrow, one hit point; every shot must be perfect
Tony Hawk's Underground
Combos plus off-board tricks keep the input ceiling high
Titan Souls leans a little harder on reads, though the gap is small.
Titan Souls
Bosses are scripted patterns, not adaptive minds
Tony Hawk's Underground
Story missions are scripted, not adaptive
Titan Souls leans a little harder on variance, though the gap is small.
Titan Souls
Unknown boss gimmicks only on first attempts
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.
Titan Souls
Each titan has a solvable weak-point strategy
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.