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
Crowd-control execution against memorised enemy patterns, stage by stage.

Execution · Practiced Mastery
Arcade run-and-gun reflexes over memorised enemy placements.
Streets of Rage leans Execution (Practiced Mastery); Top Gunner 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.
Streets of Rage
Spacing, crowd control and throw timing carry every stage
Top Gunner
Dodging bullet streams in the jeep is pure arcade reflex
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Streets of Rage
Enemy gangs attack from fixed arcade patterns
Top Gunner
Enemy emplacements fire on fixed scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Streets of Rage
Spawns are essentially deterministic per stage
Top Gunner
Layouts never change between credits
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Streets of Rage
One-credit clears come from learned positioning and patterns
Top Gunner
Memorising spawn points and POW routes maximises score runs
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.