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 baseball testing hit timing and pitch prediction in versus play.

Execution · Competitive PvP
Large-battle aim and positioning with light prediction against human players.
Mario Superstar Baseball leans Execution (Competitive PvP); Star Wars: Battlefront II leans Execution (Competitive PvP).
Star Wars: Battlefront II leans a little harder on execution, though the gap is small.
Mario Superstar Baseball
Bat timing and charged pitches are the core motor test
Star Wars: Battlefront II
Aimbot dominates infantry fights and starfighter dogfights
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Superstar Baseball
Guessing a human pitcher's mix is the versus layer
Star Wars: Battlefront II
Human opponents in multiplayer create modest prediction play
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Superstar Baseball
Star swings and bobbles add bounded randomness
Star Wars: Battlefront II
Spawns, vehicle availability and hero pickups add chaos
Star Wars: Battlefront II leans a little harder on optimization, though the gap is small.
Mario Superstar Baseball
Chemistry pairings and lineups are quickly learned
Star Wars: Battlefront II
Class choice and map control reward learned plans
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.