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

Execution · Practiced Mastery
Straightforward cover-shooting aim against fully scripted enemy waves.

Execution · Practiced Mastery
A cinematic open-world western leaning on shooting feel and atmosphere.
Army of Two: The Devil's Cartel leans Execution (Practiced Mastery); Red Dead Redemption 2 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.
Army of Two: The Devil's Cartel
Cover shooting rewards decent aim, nothing more
Red Dead Redemption 2
Gunplay and Dead Eye reward aim and timing.
Red Dead Redemption 2 leans a little harder on reads, though the gap is small.
Army of Two: The Devil's Cartel
Cartel enemies follow scripted cover AI
Red Dead Redemption 2
Enemies use scripted AI patterns, not adaptation.
Red Dead Redemption 2 leans a little harder on variance, though the gap is small.
Army of Two: The Devil's Cartel
Encounters replay identically
Red Dead Redemption 2
Some hunting and weather randomness, lightly hidden.
Red Dead Redemption 2 leans a little harder on optimization, though the gap is small.
Army of Two: The Devil's Cartel
Weapon customization adds light loadout math
Red Dead Redemption 2
Loadouts and routes solvable but loose.
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.