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
A cinematic open-world western leaning on shooting feel and atmosphere.

Execution · Practiced Mastery
Managing air meter and shortcut routes at speed on memorised tracks.
Red Dead Redemption 2 leans Execution (Practiced Mastery); Sonic Riders leans Execution (Practiced Mastery).
Sonic Riders leans a little harder on execution, though the gap is small.
Red Dead Redemption 2
Gunplay and Dead Eye reward aim and timing.
Sonic Riders
Air management, drift timing and shortcuts demand practiced hands
Sonic Riders leans a little harder on reads, though the gap is small.
Red Dead Redemption 2
Enemies use scripted AI patterns, not adaptation.
Sonic Riders
Versus humans there is mild positional jockeying
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Red Dead Redemption 2
Some hunting and weather randomness, lightly hidden.
Sonic Riders
Item and turbulence placement adds light randomness
Sonic Riders leans a little harder on optimization, though the gap is small.
Red Dead Redemption 2
Loadouts and routes solvable but loose.
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.