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 falling-capsule puzzle testing speed placement to clear virus layouts.

Execution · Pure Mechanics
The first online Mario Kart, infamous for the execution-heavy snaking technique dominating play.
Dr. Mario Online Rx leans Execution (Pure Mechanics); Mario Kart DS 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.
Dr. Mario Online Rx
Fast capsule placement under speed-up is the lead skill
Mario Kart DS
Snaking demands relentless precise drift inputs
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dr. Mario Online Rx
Versus play adds light anticipation of opponent tempo
Mario Kart DS
Online opponents punish predictable lines
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dr. Mario Online Rx
Capsule colors are random but quickly mappable
Mario Kart DS
Item RNG decides tight finishes
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dr. Mario Online Rx
Clearing virus layouts has known efficient patterns
Mario Kart DS
Kart stats, lines, and snaking routes
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.