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
Coordinating two-man cover tactics and aggro swaps through scripted firefights.

Optimization · Practiced Mastery
Open-world survival-flavored tactical shooter built around gear progression and base infiltration.
Army of Two: The 40th Day leans Execution (Practiced Mastery); Tom Clancy's Ghost Recon Breakpoint leans Optimization (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 40th Day
Cover shooting needs competent aim but generous systems forgive
Tom Clancy's Ghost Recon Breakpoint
Stealth shooting and drone play reward precise aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Army of Two: The 40th Day
Enemy AI is scripted, co-op partner cooperates rather than opposes
Tom Clancy's Ghost Recon Breakpoint
Drones and soldiers run fixed behaviors, never model you
Tom Clancy's Ghost Recon Breakpoint leans a little harder on variance, though the gap is small.
Army of Two: The 40th Day
Encounters are scripted with minor spawn unknowns first time
Tom Clancy's Ghost Recon Breakpoint
Patrols and gear drops add light randomness
Tom Clancy's Ghost Recon Breakpoint leans a little harder on optimization, though the gap is small.
Army of Two: The 40th Day
Aggro management and weapon upgrades reward planned coordination
Tom Clancy's Ghost Recon Breakpoint
Gear score, builds, and infiltration routes drive success
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.