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
Black-and-white Wii brawler chasing stylish kills for points.

Execution · Practiced Mastery
Classic action execution through fixed levels and scripted boss patterns.
MadWorld leans Execution (Practiced Mastery); Spider-Man 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.
MadWorld
Motion-combo brawling and boss QTE timing
Spider-Man
Swinging, combat and timed escapes need real dexterity
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
MadWorld
Enemies are scripted fodder
Spider-Man
Villains repeat fixed boss patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
MadWorld
Arenas are fixed
Spider-Man
Level events are scripted and quickly known
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
MadWorld
Score multipliers reward creative kill routing
Spider-Man
Boss patterns and level routes are fully learnable
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.