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
Memorise-and-execute shmup with a shop economy layered on fixed waves.
Streets of Rage leans Execution (Practiced Mastery); Xenon 2: Megablast 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
Xenon 2: Megablast
Weaving through bullet patterns and waves demands precise control
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
Xenon 2: Megablast
Alien waves follow identical scripts every run
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
Xenon 2: Megablast
Fully deterministic once levels are learned
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
Xenon 2: Megablast
Shop economy and wave memorisation reward planned 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.