head to head
Dead Space (2008) asks more than Red Dead Redemption 2, and the gap is execution.

Execution · Practiced Mastery
Strategic dismemberment under resource pressure, solved by upgrade planning and practiced limb-aiming.

Execution · Practiced Mastery
A cinematic open-world western leaning on shooting feel and atmosphere.
Dead Space (2008) leans Execution (Practiced Mastery); Red Dead Redemption 2 leans Execution (Practiced Mastery).
Dead Space (2008) leans clearly harder on execution.
Dead Space (2008)
Precise limb-targeting under Necromorph pressure is the core skill
Red Dead Redemption 2
Gunplay and Dead Eye reward aim and timing.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dead Space (2008)
Necromorphs follow fixed approach patterns, not player modelling
Red Dead Redemption 2
Enemies use scripted AI patterns, not adaptation.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dead Space (2008)
Store stock is deterministic; minor drop variance on kills
Red Dead Redemption 2
Some hunting and weather randomness, lightly hidden.
Dead Space (2008) leans clearly harder on optimization.
Dead Space (2008)
Weapon upgrading, power-node routing and stasis timing are optimisable
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.