head to head
Gradius V asks more than Dead Space (2008), and the gap is optimization.

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

Optimization · Practiced Mastery
A formation-based horizontal shmup where managing your options configuration and memorising scripted enemy patterns is the game.
Dead Space (2008) leans Execution (Practiced Mastery); Gradius V leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Dead Space (2008)
Precise limb-targeting under Necromorph pressure is the core skill
Gradius V
Maintaining power-up state through dense formation fire demands precision
Dead Space (2008) leans a little harder on reads, though the gap is small.
Dead Space (2008)
Necromorphs follow fixed approach patterns, not player modelling
Gradius V
All enemy patterns are scripted Konami-classic formations
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
Gradius V
Minimal; stages are nearly deterministic
Gradius V leans clearly harder on optimization.
Dead Space (2008)
Weapon upgrading, power-node routing and stasis timing are optimisable
Gradius V
Options configuration, power-up sequencing, and checkpoint recovery are fully solvable
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.