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

Execution · Practiced Mastery
Slow-weapon stealth shooting wrapped around hidden-clue investigation.

Execution · Practiced Mastery
Open-zone Metro entry trading tunnels for a cross-Russia survival journey.
Betrayer leans Execution (Practiced Mastery); Metro Exodus 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.
Betrayer
Slow musket shots make each aimed round count
Metro Exodus
open-zone gunplay and stealth takedowns
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Betrayer
Ghostly foes patrol on scripts
Metro Exodus
human and mutant AI is mappable
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Betrayer
Clue locations and ambushes are hidden until found
Metro Exodus
weather and patrols add mild uncertainty
Metro Exodus leans a little harder on optimization, though the gap is small.
Betrayer
Mystery-piecing and loadout choices reward methodical play
Metro Exodus
crafting, scavenging, and approach planning
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.