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 · Practiced Mastery
A top-down co-op shooter testing aim and survival against alien swarms.

Execution · Pure Mechanics
An arcade test of jump timing and enemy-flipping precision on a single screen.
Bunch of Heroes leans Execution (Practiced Mastery); Mario Bros. leans Execution (Pure Mechanics).
Mario Bros. leans a little harder on execution, though the gap is small.
Bunch of Heroes
Twin-stick aiming and dodging swarms is the core
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.
Bunch of Heroes
Enemies swarm on scripted AI, no adaptation
Mario Bros.
Versus mode adds light human interference, enemies are scripted
Bunch of Heroes leans a little harder on variance, though the gap is small.
Bunch of Heroes
Enemy spawns and waves add some randomness
Mario Bros.
Enemy spawns vary slightly but patterns are quickly learned
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Bunch of Heroes
Upgrade and co-op positioning choices matter lightly
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.