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.

Optimization · Practiced Mastery
Twin-stick co-op shooter precursor.

Execution · Practiced Mastery
Roguelike soulslike shooter with deep builds.
Helldivers leans Optimization (Practiced Mastery); Remnant II leans Execution (Practiced Mastery).
Remnant II leans a little harder on execution, though the gap is small.
Helldivers
Twin-stick aim and stratagem inputs
Remnant II
Soulslike dodges with gunplay timing
Remnant II leans a little harder on reads, though the gap is small.
Helldivers
Scripted enemies, no real reads
Remnant II
Bosses scripted, not adaptive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Helldivers
Random spawns and patrol pressure
Remnant II
Procedural worlds and gear rolls vary
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Helldivers
Loadout combos and stratagem chains
Remnant II
Archetype builds and mod synergies deep
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.