head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Execution · Practiced Mastery
Arcade western shooter narrated as a bounty hunter's tall tale.

Execution · Practiced Mastery
Lightgun quick-draw reflexes against memorisable filmed ambush sequences.
Call of Juarez: Gunslinger leans Execution (Practiced Mastery); Mad Dog McCree leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Juarez: Gunslinger
Quick-draw duels and combo shooting demand precision
Mad Dog McCree
Quick-draw lightgun accuracy under strict timers
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
Mad Dog McCree
Outlaws appear in filmed, fixed sequences
Mad Dog McCree leans a little harder on variance, though the gap is small.
Call of Juarez: Gunslinger
Minor enemy placement surprises first run
Mad Dog McCree
Some ambush order shuffling, quickly mapped
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
Mad Dog McCree
Memorising who pops out where is the real progression
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.