head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Pure Optimization
A transgressive stealth horror game about an asylum escapee executing hunters from the shadows.

Optimization · Pure Optimization
Side-on turn-based tactics where you manually aim ricocheting bullets for a steambot pirate crew.
Manhunt 2 leans Optimization (Pure Optimization); SteamWorld Heist 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.
Manhunt 2
Execution-hold timing and stealth movement need steady hands
SteamWorld Heist
Manual aim and ricochet shots reward steady hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Manhunt 2
Hunter AI patrols on fixed search scripts
SteamWorld Heist
Enemy bots follow fixed behaviors
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Manhunt 2
Unknown patrol layouts until a level is scouted
SteamWorld Heist
Procedural ship layouts and loot drops
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Manhunt 2
Shadow routes and lure setups make levels solvable puzzles
SteamWorld Heist
Crew builds, weapon picks, and turn routing carry 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.