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

Execution · Practiced Mastery
Maze-clearing shooter execution with light energy and upgrade management.
Balloon Fight leans Execution (Pure Mechanics); Xybots leans Execution (Practiced Mastery).
Balloon Fight leans a little harder on execution, though the gap is small.
Balloon Fight
Flap-physics altitude duels demand precise momentum control
Xybots
First-person maze gunfights need quick turning and aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Balloon Fight
A couch rival adds light prediction; birds don't adapt
Xybots
Robot enemies follow simple fixed behaviours
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Balloon Fight
Enemy drift and lightning add arcade randomness
Xybots
Maze layouts are unknown until explored, then static
Xybots leans a little harder on optimization, though the gap is small.
Balloon Fight
Spawn patterns and safe positions are quickly mapped
Xybots
Energy management and upgrade purchases reward planning
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.