head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Grand Arena
Team hero shooter blending FPS mechanics with ability economy mind games.

Execution · Pure Mechanics
High-speed arena shooter with twitch duels and warfare-scale vehicle modes.
Overwatch leans Execution (Grand Arena); Unreal Tournament III leans Execution (Pure Mechanics).
Unreal Tournament III leans a little harder on execution, though the gap is small.
Overwatch
Hero aim, movement, and ability timing
Unreal Tournament III
Hitscan precision, dodge timing, and vehicle handling rule fights
Overwatch leans a little harder on reads, though the gap is small.
Overwatch
Ult tracking, flanks, and baiting human teams
Unreal Tournament III
Human opponents vary routes and dueling habits
Overwatch leans a little harder on variance, though the gap is small.
Overwatch
Minor spread and matchmaking noise
Unreal Tournament III
Open arenas with fully visible pickups and players
Overwatch leans a little harder on optimization, though the gap is small.
Overwatch
Team comps, ult economy, and positioning theory
Unreal Tournament III
Weapon spawns and power-up timing reward map study
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.