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 · Pure Mechanics
Punishing rally car control at the limit, supported by setup and stage knowledge.

Execution · Practiced Mastery
Combo execution layered over solving each park's optimal scoring line.
Dirt Rally leans Execution (Pure Mechanics); Tony Hawk's Underground 2 leans Execution (Practiced Mastery).
Dirt Rally leans a little harder on execution, though the gap is small.
Dirt Rally
Unforgiving car control on loose surfaces is the entire test
Tony Hawk's Underground 2
Combo timing, balance meters and manuals demand practiced hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dirt Rally
Solo time trials against the clock, no adaptive rival
Tony Hawk's Underground 2
No opponent adapts; score attack is solo
Dirt Rally leans a little harder on variance, though the gap is small.
Dirt Rally
Weather and surface degradation vary between stages
Tony Hawk's Underground 2
Maps and goals are fixed and fully knowable
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dirt Rally
Pacenote interpretation, setup tuning and stage memorisation
Tony Hawk's Underground 2
Finding the highest-scoring line through each park is 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.