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 tilt-balance action game testing fine motor control rolling a ball through fixed stages.
Metal Slug 4 leans Execution (Pure Mechanics); Super Monkey Ball Touch & Roll 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
Super Monkey Ball Touch & Roll
Tilting the stage to balance the ball demands fine control
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
Super Monkey Ball Touch & Roll
No adaptive opponent in the rolling puzzles
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
Super Monkey Ball Touch & Roll
Stages are fixed, nothing random
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
Super Monkey Ball Touch & Roll
Learning optimal lines and shortcuts through stages is the meta
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.