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
The first online Mario Kart, infamous for the execution-heavy snaking technique dominating play.

Execution · Practiced Mastery
A competitive puzzle mashup combining Puyo Puyo chains with Tetris stacking.
Mario Kart DS leans Execution (Pure Mechanics); Puyo Puyo Tetris 2 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 Kart DS
Snaking demands relentless precise drift inputs
Puyo Puyo Tetris 2
fast precise piece placement under pressure
Puyo Puyo Tetris 2 leans a little harder on reads, though the gap is small.
Mario Kart DS
Online opponents punish predictable lines
Puyo Puyo Tetris 2
human opponents bait garbage and timing
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Kart DS
Item RNG decides tight finishes
Puyo Puyo Tetris 2
piece/bean randomization each match
Puyo Puyo Tetris 2 leans a little harder on optimization, though the gap is small.
Mario Kart DS
Kart stats, lines, and snaking routes
Puyo Puyo Tetris 2
chain-building and stacking theory mastery
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.