head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Practiced Mastery
Isometric co-op action puzzler that mixes twin-stick combat with tomb puzzles.

Optimization · Practiced Mastery
Timing-based RPG combat layered over learnable scripted enemy tells.
Lara Croft and the Guardian of Light leans Optimization (Practiced Mastery); Mario & Luigi: Dream Team leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Lara Croft and the Guardian of Light
Twin-stick aiming and timed platforming under fire
Mario & Luigi: Dream Team
Action-command timing on every attack and dodge matters
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Lara Croft and the Guardian of Light
Enemies spawn in fixed scripted waves
Mario & Luigi: Dream Team
Enemy attacks are scripted tells to memorise
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Lara Croft and the Guardian of Light
Levels deterministic once seen
Mario & Luigi: Dream Team
Battles are deterministic once tells are known
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Lara Croft and the Guardian of Light
Puzzle solutions, relic loadouts, and score routing
Mario & Luigi: Dream Team
Gear, badges and attack choice reward system knowledge
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.