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 · Pure Mechanics
Floaty one-button momentum control in arcade altitude duels.

Execution · Pure Mechanics
Kart drift control and track knowledge with item luck shaking up placements.
Balloon Fight leans Execution (Pure Mechanics); SuperTuxKart leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Balloon Fight
Flap-physics altitude duels demand precise momentum control
SuperTuxKart
Drift control and line holding decide races
SuperTuxKart leans a little harder on reads, though the gap is small.
Balloon Fight
A couch rival adds light prediction; birds don't adapt
SuperTuxKart
Human online races reward mild item mind-games
SuperTuxKart leans a little harder on variance, though the gap is small.
Balloon Fight
Enemy drift and lightning add arcade randomness
SuperTuxKart
Item box rolls shake up placements
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Balloon Fight
Spawn patterns and safe positions are quickly mapped
SuperTuxKart
Track shortcuts and kart choice reward study
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.