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 · Practiced Mastery
Zelda-flavored musou about juggling battlefield objectives while mowing hordes.

Optimization · Practiced Mastery
Double Fine's tower-defense shooter where you fight TV monsters from a customizable trench-mech.
Hyrule Warriors leans Optimization (Practiced Mastery); Iron Brigade 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.
Hyrule Warriors
Combo strings and weak-point gauge timing
Iron Brigade
Manual aiming from your walking trench-mech
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Hyrule Warriors
Enemy hordes are mindless and scripted
Iron Brigade
Tube waves arrive on schedule
Iron Brigade leans a little harder on variance, though the gap is small.
Hyrule Warriors
Minor drop and mission randomness
Iron Brigade
Loot drops randomize gear options
Iron Brigade leans a little harder on optimization, though the gap is small.
Hyrule Warriors
Keep management, character builds, and map priorities
Iron Brigade
Turret placement and mech loadout economy
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.