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
Arcade western shooter narrated as a bounty hunter's tall tale.

Execution · Practiced Mastery
Helicopter handling under fire while routing fuel and ammo across fixed missions.
Call of Juarez: Gunslinger leans Execution (Practiced Mastery); Desert Strike: Return to the Gulf leans Execution (Practiced Mastery).
Call of Juarez: Gunslinger leans a little harder on execution, though the gap is small.
Call of Juarez: Gunslinger
Quick-draw duels and combo shooting demand precision
Desert Strike: Return to the Gulf
Helicopter inertia and dodging fire demand real stick control
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Juarez: Gunslinger
Enemies are scripted gallery targets
Desert Strike: Return to the Gulf
Defenses are fixed emplacements, nothing adapts
Desert Strike: Return to the Gulf leans a little harder on variance, though the gap is small.
Call of Juarez: Gunslinger
Minor enemy placement surprises first run
Desert Strike: Return to the Gulf
Maps are unknown on first sortie only
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Juarez: Gunslinger
Score routes, skill trees, duel timing knowledge
Desert Strike: Return to the Gulf
Fuel, ammo and mission-order routing is the strategic core
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.