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 · Pure Mechanics
Comic-panel beat 'em up notorious for punishing health drain and tough fights.
Call of Juarez: Gunslinger leans Execution (Practiced Mastery); Comix Zone leans Execution (Pure Mechanics).
Comix Zone leans a little harder on execution, though the gap is small.
Call of Juarez: Gunslinger
Quick-draw duels and combo shooting demand precision
Comix Zone
Brutal one-life brawling demands clean play
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
Comix Zone
Enemies follow fixed attack scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Juarez: Gunslinger
Minor enemy placement surprises first run
Comix Zone
Everything is placed and scripted
Call of Juarez: Gunslinger leans a little harder on optimization, though the gap is small.
Call of Juarez: Gunslinger
Score routes, skill trees, duel timing knowledge
Comix Zone
Panel routes and item use are memorizable
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.