head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
NES platformer that codified boss-weakness ordering and tight jump-and-shoot play.

Execution · Practiced Mastery
Combo execution layered over solving each park's optimal scoring line.
Mega Man 2 leans Execution (Practiced Mastery); Tony Hawk's Underground 2 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.
Mega Man 2
precise jumps and boss dodges under pressure
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.
Mega Man 2
robot masters follow strict patterns
Tony Hawk's Underground 2
No opponent adapts; score attack is solo
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mega Man 2
deterministic once stage layouts known
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.
Mega Man 2
weapon-weakness ordering is the classic solve
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.