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
Comic-panel beat 'em up notorious for punishing health drain and tough fights.

Execution · Pure Mechanics
A reflex-driven isometric runner about dodging hazards at high speed.
Comix Zone 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.
Comix Zone
Brutal one-life brawling demands clean play
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.
Comix Zone
Enemies follow fixed attack scripts
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.
Comix Zone
Everything is placed and scripted
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.
Comix Zone
Panel routes and item use are memorizable
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.