head to head
Hearthstone asks more than Dota Underlords, and the gap is reads.

Optimization · Systems & Chaos
Valve's autobattler where eight players manage economy and units around a shared random shop.

Variance · Grand Arena
A digital card game balancing opponent reads against draw variance.
Dota Underlords leans Optimization (Systems & Chaos); Hearthstone leans Variance (Grand Arena).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Dota Underlords
Drag-and-drop placement, no twitch component
Hearthstone
Clicks only, no mechanical skill
Hearthstone leans clearly harder on reads.
Dota Underlords
Scouting lobbies and contesting opponents' compositions
Hearthstone
Human opponents bluff and adapt mid-match
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dota Underlords
Random shop rolls and item drops drive every game
Hearthstone
Draw RNG and discover effects swing games
Dota Underlords leans a little harder on optimization, though the gap is small.
Dota Underlords
Economy management and composition math dominate
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.