head to head
Neither is simply harder - they are hard in different places. Arena Breakout: Infinite demands more variance; StarCraft demands more optimization.

Execution · Grand Arena
High-stakes extraction raids testing aim, opponent prediction, and loot-economy mastery at once.

Optimization · Grand Arena
A real-time strategy classic where perfected build orders and mechanical speed decide most matches.
Arena Breakout: Infinite leans Execution (Grand Arena); StarCraft leans Optimization (Grand Arena).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Arena Breakout: Infinite
Gunfights against humans punish slow aim instantly
StarCraft
APM and micro control ceiling is huge
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Arena Breakout: Infinite
Predicting other squads' rotations and ambushes is constant
StarCraft
scouting and predicting human opponent builds
Arena Breakout: Infinite leans clearly harder on variance.
Arena Breakout: Infinite
Loot spawns and unseen player positions dominate raid outcomes
StarCraft
minimal hidden info beyond fog of war
StarCraft leans clearly harder on optimization.
Arena Breakout: Infinite
Ammo tiers, insurance economy and map routes reward deep study
StarCraft
build orders and economy are near-solvable
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.