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

Execution · Pure Mechanics
A precision movement game disguised as a card-action roguelite, decided almost purely by execution.

Execution · Pure Mechanics
A pure time-attack arcade racer testing flawless car control on precision platform tracks.
Neon White leans Execution (Pure Mechanics); Trackmania Turbo leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Neon White
Card-discarding movement tech is the entire game at maximum precision
Trackmania Turbo
Platform-racer precision; every millisecond of input matters
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Neon White
Solo time-trial levels; no opponent to read or predict
Trackmania Turbo
Ghost-only competition; no adaptive opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Neon White
Fixed levels with no randomness; entirely deterministic
Trackmania Turbo
Deterministic tracks with no hidden randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Neon White
Route optimisation and card-discard sequencing form the depth layer
Trackmania Turbo
Finding the fastest line and technique per track is fully solvable
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.