head to head
Neither is simply harder - they are hard in different places. Heavy Rain demands more execution; Life is Strange demands more optimization.

Execution · Light / Casual
Branching interactive thriller where QTE choices decide who survives the Origami Killer case.

Optimization · Systems & Chaos
A teenage drama built around rewinding decisions to map which choices actually alter the scripted outcome.
Heavy Rain leans Execution (Light / Casual); Life is Strange leans Optimization (Systems & Chaos).
Heavy Rain leans clearly harder on execution.
Heavy Rain
QTE prompts under tension
Life is Strange
Rewind mechanic removes virtually any failure state
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Heavy Rain
No adaptive opposition
Life is Strange
Scripted teen drama; no opponent models the player
Life is Strange leans a little harder on variance, though the gap is small.
Heavy Rain
First-run uncertainty about consequences
Life is Strange
Rewind obscures which choices are truly consequential
Life is Strange leans clearly harder on optimization.
Heavy Rain
Branch knowledge fully solves outcomes
Life is Strange
Understanding consequence chains enables deliberate dialogue path planning
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.