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
An arcade test of jump timing and enemy-flipping precision on a single screen.

Execution · Practiced Mastery
A Space Invaders descendant testing arcade aim plus an upgrade-economy layer.
Mario Bros. leans Execution (Pure Mechanics); Titan Attacks! leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Bros.
Precise jumps and bump timing under crowding enemies decide survival
Titan Attacks!
Dodging fire while sniping descending waves is pure arcade aim
Mario Bros. leans a little harder on reads, though the gap is small.
Mario Bros.
Versus mode adds light human interference, enemies are scripted
Titan Attacks!
Alien waves follow fixed formations
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Bros.
Enemy spawns vary slightly but patterns are quickly learned
Titan Attacks!
Bounty drops and saucer timing add minor noise
Titan Attacks! leans a little harder on optimization, though the gap is small.
Mario Bros.
POW block usage and enemy routing have known best lines
Titan Attacks!
Upgrade purchases between waves form a small economy to solve
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.