head to head
Gran Turismo 5 Prologue asks more than Red Dead Redemption 2, and the gap is execution.

Execution · Practiced Mastery
Shaving lap time through precise car control and solvable line and tuning choices.

Execution · Practiced Mastery
A cinematic open-world western leaning on shooting feel and atmosphere.
Gran Turismo 5 Prologue leans Execution (Practiced Mastery); Red Dead Redemption 2 leans Execution (Practiced Mastery).
Gran Turismo 5 Prologue leans clearly harder on execution.
Gran Turismo 5 Prologue
Braking points and throttle control decide every lap time
Red Dead Redemption 2
Gunplay and Dead Eye reward aim and timing.
Gran Turismo 5 Prologue leans a little harder on reads, though the gap is small.
Gran Turismo 5 Prologue
Online racecraft adds light wheel-to-wheel prediction
Red Dead Redemption 2
Enemies use scripted AI patterns, not adaptation.
Red Dead Redemption 2 leans a little harder on variance, though the gap is small.
Gran Turismo 5 Prologue
Tracks and physics are fixed and fully knowable
Red Dead Redemption 2
Some hunting and weather randomness, lightly hidden.
Gran Turismo 5 Prologue leans clearly harder on optimization.
Gran Turismo 5 Prologue
Tuning setups and racing lines are an engineering problem
Red Dead Redemption 2
Loadouts and routes solvable but loose.
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.