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
Side-scrolling roguelike where item synergies snowball against a relentless difficulty clock.

Execution · Twitch Chaos
Dodging under fire while leveraging deep item knowledge against run RNG.
Risk of Rain leans Optimization (Practiced Mastery); The Binding of Isaac: Afterbirth+ leans Execution (Twitch Chaos).
The Binding of Isaac: Afterbirth+ leans a little harder on execution, though the gap is small.
Risk of Rain
Dodging projectiles and platforming under scaling pressure.
The Binding of Isaac: Afterbirth+
Dodging bullet patterns while aiming tears is constant
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Risk of Rain
Enemies spawn and chase; no adaptation.
The Binding of Isaac: Afterbirth+
Enemies are random or scripted, never adaptive
The Binding of Isaac: Afterbirth+ leans a little harder on variance, though the gap is small.
Risk of Rain
Item drops and stage rolls dominate run identity.
The Binding of Isaac: Afterbirth+
Item pools, room layouts and pickups define each run
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Risk of Rain
Item stacking and time-pressure routing is solvable.
The Binding of Isaac: Afterbirth+
Encyclopedic item synergy knowledge converts variance into wins
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.