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

Execution · Competitive PvP
Cover-based shotgun duels testing movement execution and positional prediction in multiplayer.

Execution · Competitive PvP
Arcade tennis with timing-based PvP mind games.
Gears of War: Ultimate Edition leans Execution (Competitive PvP); Mario Tennis Aces leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Gears of War: Ultimate Edition
Wallbounce movement and gnasher duels demand real hands
Mario Tennis Aces
Shot timing, charge mechanics, footwork
Mario Tennis Aces leans a little harder on reads, though the gap is small.
Gears of War: Ultimate Edition
Multiplayer is constant positional mind-games around cover
Mario Tennis Aces
Online tennis demands reading opponent placement
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Gears of War: Ultimate Edition
Weapon spawns timed and known; spread mildly random
Mario Tennis Aces
Mostly deterministic ball physics
Gears of War: Ultimate Edition leans a little harder on optimization, though the gap is small.
Gears of War: Ultimate Edition
Map control and spawn timing knowledge structure matches
Mario Tennis Aces
Character matchups and tech routes
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.