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

Optimization · Pure Optimization
A third-person tower defense about funneling orc hordes into gleefully lethal trap corridors.

Optimization · Pure Optimization
Minimalist build-order puzzles defended with light real-time positioning.
Orcs Must Die! leans Optimization (Pure Optimization); Thronefall leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Orcs Must Die!
Active shooting supplements the traps
Thronefall
Kiting and positioning your lord at night takes modest control
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Orcs Must Die!
Orc waves follow fixed paths
Thronefall
Waves are previewed and scripted, never adaptive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Orcs Must Die!
Minor wave composition randomness
Thronefall
Minimal randomness; wave compositions are shown
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Orcs Must Die!
Trap placement and kill-corridor economics are the game
Thronefall
Build order and perk loadouts decide every map
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.