head to head
vs
OverwatchvsStarCraft
Overwatch leans Execution (Grand Arena); StarCraft leans Optimization (Grand Arena).
OverwatchStarCraft
Axis by axis
Execution8 vs 7
Overwatch leans harder on execution: Hero aim, movement, and ability timing
Reads7 vs 6
Overwatch leans harder on reads: Ult tracking, flanks, and baiting human teams
Variance2 vs 1
Overwatch leans harder on variance: Minor spread and matchmaking noise
Optimization6 vs 9
StarCraft leans harder on optimization: build orders and economy are near-solvable
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.