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

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

Optimization · Practiced Mastery
A tighter sequel that raises execution demands while deepening the build and meta-progression systems.
Helldivers leans Optimization (Practiced Mastery); Rogue Legacy 2 leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Helldivers
Twin-stick aim and stratagem inputs
Rogue Legacy 2
More demanding platforming and combat than the original
Helldivers leans a little harder on reads, though the gap is small.
Helldivers
Scripted enemies, no real reads
Rogue Legacy 2
All enemies follow learned scripted patterns
Helldivers leans a little harder on variance, though the gap is small.
Helldivers
Random spawns and patrol pressure
Rogue Legacy 2
Class randomisation and relic pools create divergent runs
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
Rogue Legacy 2
Heirloom upgrades and class mastery form a deep meta-progression system
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.