head to head
Nintendo Land asks more than Garry's Mod, and the gap is execution.

Reads · Light / Casual
Source-engine sandbox whose community modes range from building to social deduction.

Execution · Competitive PvP
Wii U minigame park whose asymmetric hide-and-seek modes shine with friends.
Garry's Mod leans Reads (Light / Casual); Nintendo Land leans Execution (Competitive PvP).
Nintendo Land leans clearly harder on execution.
Garry's Mod
Varies by mode; base sandbox is undemanding
Nintendo Land
Motion and GamePad dexterity across minigames
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Garry's Mod
Social deduction modes like TTT involve humans
Nintendo Land
Asymmetric chase games create real human mind-games
Garry's Mod leans a little harder on variance, though the gap is small.
Garry's Mod
Hidden roles and player chaos in popular modes
Nintendo Land
Some random layouts and item spawns
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Garry's Mod
Contraption building rewards systems knowledge
Nintendo Land
Per-attraction tactics, mostly shallow
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.