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

Optimization · Pure Optimization
A zombie survival crafter where horde-night base design carries the game.

Optimization · Pure Optimization
A GBA metroidvania built around collecting enemy souls.
7 Days to Die leans Optimization (Pure Optimization); Castlevania: Aria of Sorrow leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
7 Days to Die
Aim and movement during horde nights matter.
Castlevania: Aria of Sorrow
Modest action timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
7 Days to Die
Zombie AI is largely scripted with minor pathing adaptation.
Castlevania: Aria of Sorrow
Scripted enemies
7 Days to Die leans a little harder on variance, though the gap is small.
7 Days to Die
World generation and loot rolls randomized.
Castlevania: Aria of Sorrow
Soul drops are heavily random
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
7 Days to Die
Base design and horde-night kill funnels dominate.
Castlevania: Aria of Sorrow
Soul build crafting dominates
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.