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 · Competitive PvP
Arcade tennis with timing-based PvP mind games.

Execution · Competitive PvP
A movement-first multiplayer shooter where parkour aim duels decide fights.
Mario Tennis Aces leans Execution (Competitive PvP); Titanfall leans Execution (Competitive PvP).
Titanfall leans a little harder on execution, though the gap is small.
Mario Tennis Aces
Shot timing, charge mechanics, footwork
Titanfall
Wall-running gunfights demand elite aim and movement
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Tennis Aces
Online tennis demands reading opponent placement
Titanfall
Human pilots adapt positioning and titan timing against you
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Tennis Aces
Mostly deterministic ball physics
Titanfall
Some uncertainty in titan drops and flanks
Titanfall leans a little harder on optimization, though the gap is small.
Mario Tennis Aces
Character matchups and tech routes
Titanfall
Loadouts and titan timing are a thin solvable layer
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.