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

Execution · Practiced Mastery
A medieval-flavored Doom prequel built around shield parries and heavy combat.

Execution · Practiced Mastery
Landmark scripted FPS following Gordon Freeman through the Black Mesa disaster.
Doom: The Dark Ages leans Execution (Practiced Mastery); Half-Life leans Execution (Practiced Mastery).
Doom: The Dark Ages leans a little harder on execution, though the gap is small.
Doom: The Dark Ages
Parry timing and shield play demand precise inputs
Half-Life
Combat aim and infamous platforming sections
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Doom: The Dark Ages
Demon attack patterns are fixed and learnable
Half-Life
Marines flank by script, not by modelling you
Half-Life leans a little harder on variance, though the gap is small.
Doom: The Dark Ages
Encounters fully scripted
Half-Life
Set pieces surprise only on first run
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Doom: The Dark Ages
Upgrade paths and combat-loop mastery solve fights
Half-Life
Resource routing and encounter knowledge for speedruns
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.