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
Arcade wrestling testing combo execution and reversal mind-games against humans.
Mario Tennis Aces leans Execution (Competitive PvP); WWE All Stars leans Execution (Competitive PvP).
Mario Tennis Aces leans a little harder on execution, though the gap is small.
Mario Tennis Aces
Shot timing, charge mechanics, footwork
WWE All Stars
Juggle combos and reversal timing drive every match
Mario Tennis Aces leans a little harder on reads, though the gap is small.
Mario Tennis Aces
Online tennis demands reading opponent placement
WWE All Stars
Human opponents bait reversals in constant mind-games
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
WWE All Stars
Slight hit randomness rarely decides outcomes
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Tennis Aces
Character matchups and tech routes
WWE All Stars
Class matchups and move properties are quickly learnable
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.