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

Execution · Competitive PvP
Reflex disc rallies decided by throw precision and outguessing the human opponent.

Execution · Competitive PvP
Arcade tennis with timing-based PvP mind games.
Disc Jam 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.
Disc Jam
Volley timing, angles and positioning are pure reflex
Mario Tennis Aces
Shot timing, charge mechanics, footwork
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Disc Jam
Rallies are won by faking out the human across the net
Mario Tennis Aces
Online tennis demands reading opponent placement
Mario Tennis Aces leans a little harder on variance, though the gap is small.
Disc Jam
Physics are consistent, almost nothing random
Mario Tennis Aces
Mostly deterministic ball physics
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Disc Jam
Character kits and throw tech form a thin meta
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.