head to head
Neither is simply harder - they are hard in different places. Blood on the Clocktower demands more reads; Hearthstone demands more optimization.

Reads · Pure Mind Games
Reading human liars while solving a logic puzzle built on hidden roles.

Variance · Grand Arena
A digital card game balancing opponent reads against draw variance.
Blood on the Clocktower leans Reads (Pure Mind Games); Hearthstone leans Variance (Grand Arena).
Hearthstone leans a little harder on execution, though the gap is small.
Blood on the Clocktower
Talking takes no physical skill
Hearthstone
Clicks only, no mechanical skill
Blood on the Clocktower leans clearly harder on reads.
Blood on the Clocktower
Detecting human lies and modelling bluffers is the whole game
Hearthstone
Human opponents bluff and adapt mid-match
Hearthstone leans a little harder on variance, though the gap is small.
Blood on the Clocktower
Hidden roles and storyteller setup drive every game's information
Hearthstone
Draw RNG and discover effects swing games
Hearthstone leans clearly harder on optimization.
Blood on the Clocktower
Role interactions and logic chains reward systematic deduction
Hearthstone
Deckbuilding, mulligans, and mana curves matter
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.