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 linear western shooter testing aim and learned encounter pacing through scripted set pieces.

Execution · Pure Mechanics
A top-down shoot-em-up testing aim and dodging against scripted alien waves.
Call of Juarez: Bound In Blood leans Execution (Practiced Mastery); Earth Defense Force leans Execution (Pure Mechanics).
Earth Defense Force leans a little harder on execution, though the gap is small.
Call of Juarez: Bound In Blood
Aimbot would trivialise the gunfights and showdown duels
Earth Defense Force
Top-down shooting and dodging are the core demand
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Juarez: Bound In Blood
Scripted campaign enemies; thin multiplayer adds little prediction
Earth Defense Force
Enemies are scripted waves, not adaptive
Earth Defense Force leans a little harder on variance, though the gap is small.
Call of Juarez: Bound In Blood
Encounter layouts are unknown on first run, then fixed
Earth Defense Force
Enemy spawn patterns add some unpredictability
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Juarez: Bound In Blood
Cover routes and concentration-mode usage are learnable patterns
Earth Defense Force
Weapon management and positioning aid survival
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.