head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Practiced Mastery
Aggressive circuit racing testing car control over memorisable tracks and braking points.

Execution · Pure Mechanics
High-speed trick execution along optimised lines down fixed mountains.
Race Driver: Grid leans Execution (Practiced Mastery); SSX leans Execution (Pure Mechanics).
SSX leans a little harder on execution, though the gap is small.
Race Driver: Grid
Aggressive wheel-to-wheel car control is the core demand
SSX
Trick timing, landings and line control at speed are everything
Race Driver: Grid leans a little harder on reads, though the gap is small.
Race Driver: Grid
Online racing adds light opponent positioning awareness
SSX
Rival AI racers are aggressive but mappable
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Race Driver: Grid
Damage outcomes add slight unpredictability to contact
SSX
Courses are fixed once learned
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Race Driver: Grid
Braking points, lines and flashback management are learnable
SSX
Optimal trick lines and shortcut routing maximise score
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.