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

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

Execution · Pure Mechanics
An arcade test of jump timing and enemy-flipping precision on a single screen.
Balloon Fight leans Execution (Pure Mechanics); Mario Bros. 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
Mario Bros.
Precise jumps and bump timing under crowding enemies decide survival
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
Mario Bros.
Versus mode adds light human interference, enemies are scripted
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
Mario Bros.
Enemy spawns vary slightly but patterns are quickly learned
Mario Bros. leans a little harder on optimization, though the gap is small.
Balloon Fight
Spawn patterns and safe positions are quickly mapped
Mario Bros.
POW block usage and enemy routing have known best lines
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.