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
Punishing 2D gunplay that tests raw aim and movement against fixed deadly rooms.

Execution · Pure Mechanics
Arcade run-and-gun reflexes against fully memorisable boss patterns.
Butcher leans Execution (Pure Mechanics); Sunset Riders 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.
Butcher
Brutal twitch aim and movement under instant-death pressure
Sunset Riders
Dodging bullet spreads and snap-shooting bosses is everything
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Butcher
Enemy placements and behaviours are fixed scripts
Sunset Riders
Bandits and bosses cycle memorisable arcade patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Butcher
Levels are deterministic, runs differ only by your play
Sunset Riders
Spawns are deterministic each credit
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Butcher
Weapon choice and room routing reward study
Sunset Riders
Pattern memorisation for one-credit clears is the meta-game
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.