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
Steady aim against scripted alien swarms with an upgrade economy underneath.

Execution · Practiced Mastery
Arcade beat-em-up classic about brawling through Metro City's gangs.
Alien Breed: Impact leans Execution (Practiced Mastery); Final Fight 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.
Alien Breed: Impact
Kiting alien swarms top-down demands steady aim and movement
Final Fight
Crowd-control timing and throw spacing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Alien Breed: Impact
Aliens swarm on scripts, never modelling you
Final Fight
Thugs spawn and attack on scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Alien Breed: Impact
Ambush triggers are scripted-but-unknown first time through
Final Fight
Minor enemy placement randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Alien Breed: Impact
Weapon upgrades and ammo economy reward planning
Final Fight
Memorising waves and damage-efficient patterns
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.