head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Practiced Mastery
A top-down shooter testing aim and resource management against alien swarms.

Execution · Pure Mechanics
A test of fast, precise shooting and map navigation against scripted but relentless enemies.
Alien Breed Evolution leans Execution (Practiced Mastery); Doom (1993) leans Execution (Pure Mechanics).
Doom (1993) leans a little harder on execution, though the gap is small.
Alien Breed Evolution
Twin-stick aiming under alien swarms demands reflexes
Doom (1993)
Precise movement and shooting against relentless enemy pressure
Alien Breed Evolution leans a little harder on reads, though the gap is small.
Alien Breed Evolution
Aliens charge on scripts, nothing adapting to you
Doom (1993)
Enemies follow scripted patrol and attack patterns, not adaptive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Alien Breed Evolution
Spawn timing and ambushes add unpredictability
Doom (1993)
Enemy placement is fixed but unknown on first run through levels
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Alien Breed Evolution
Ammo and upgrade management reward resource planning
Doom (1993)
Level routing and resource management determine survival efficiency
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.