head to head
Neither is simply harder - they are hard in different places. Dota 2 demands more optimization; Overwatch demands more execution.

Optimization · Grand Arena
A deep MOBA where draft theory and adaptive mind games drive every fight.

Execution · Grand Arena
Team hero shooter blending FPS mechanics with ability economy mind games.
Dota 2 leans Optimization (Grand Arena); Overwatch leans Execution (Grand Arena).
Overwatch leans clearly harder on execution.
Dota 2
Last-hits and spell timing demand precision.
Overwatch
Hero aim, movement, and ability timing
Dota 2 leans a little harder on reads, though the gap is small.
Dota 2
Drafts and ganks revolve around adaptive opponents.
Overwatch
Ult tracking, flanks, and baiting human teams
Dota 2 leans clearly harder on variance.
Dota 2
Crits, bashes, and bounty runes add noise.
Overwatch
Minor spread and matchmaking noise
Dota 2 leans clearly harder on optimization.
Dota 2
Item builds, timings, and lane theory are deep.
Overwatch
Team comps, ult economy, and positioning theory
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.