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
Columbia's sky-rail shooter wrapped in dimensional intrigue.
Army of Two: The Devil's Cartel leans Execution (Practiced Mastery); BioShock Infinite 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
BioShock Infinite
Skyline traversal and aiming reward inputs.
BioShock Infinite leans a little harder on reads, though the gap is small.
Army of Two: The Devil's Cartel
Cartel enemies follow scripted cover AI
BioShock Infinite
Enemies scripted in arena waves.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Army of Two: The Devil's Cartel
Encounters replay identically
BioShock Infinite
Loot drops mildly randomized.
BioShock Infinite leans a little harder on optimization, though the gap is small.
Army of Two: The Devil's Cartel
Weapon customization adds light loadout math
BioShock Infinite
Gear, vigors, weapon picks straightforward.
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.