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

Execution · Pure Mechanics
A run-and-gun shooter where memorizing enemy patterns and precise dodging carries survival.

Execution · Pure Mechanics
A reflex-driven isometric runner about dodging hazards at high speed.
Metal Slug 4 leans Execution (Pure Mechanics); SegaSonic the Hedgehog leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Metal Slug 4
twitch dodging and shooting precision
SegaSonic the Hedgehog
Trackball reflexes dodging hazards at speed decide survival
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Metal Slug 4
fixed enemy waves, no adaptation
SegaSonic the Hedgehog
No opponent, only environmental traps
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Metal Slug 4
minor drop randomness
SegaSonic the Hedgehog
Hazards are fixed once a course is learned
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Metal Slug 4
memorized patterns and routes solvable
SegaSonic the Hedgehog
Memorizing the optimal route through each stage helps
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.