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
Tests sustained drift-boost execution and track routing under light item chaos.

Execution · Practiced Mastery
Managing air meter and shortcut routes at speed on memorised tracks.
Crash Nitro Kart leans Execution (Practiced Mastery); Sonic Riders leans Execution (Practiced Mastery).
Crash Nitro Kart leans a little harder on execution, though the gap is small.
Crash Nitro Kart
Boost-chaining drift tech demands sustained precise inputs
Sonic Riders
Air management, drift timing and shortcuts demand practiced hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Crash Nitro Kart
Versus humans, item timing adds minor prediction
Sonic Riders
Versus humans there is mild positional jockeying
Crash Nitro Kart leans a little harder on variance, though the gap is small.
Crash Nitro Kart
Item boxes shuffle race outcomes somewhat
Sonic Riders
Item and turbulence placement adds light randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Crash Nitro Kart
Mastering track lines and boost routes rewards study
Sonic Riders
Gear choice and shortcut routes reward track study
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.