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 · Pure Mechanics
High-volume shooting accuracy through chaotic scripted raids.

Execution · Pure Mechanics
Console shooter execution across scripted set pieces and once-massive human multiplayer.
Delta Force: Black Hawk Down leans Execution (Pure Mechanics); Resistance 2 leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Delta Force: Black Hawk Down
Fast aim against dense hostile crowds is the core test
Resistance 2
Weapon handling and boss dodging demand console-shooter precision
Resistance 2 leans a little harder on reads, though the gap is small.
Delta Force: Black Hawk Down
Large multiplayer servers add human positioning play
Resistance 2
60-player multiplayer rewarded reading humans; campaign Chimera don't adapt
Delta Force: Black Hawk Down leans a little harder on variance, though the gap is small.
Delta Force: Black Hawk Down
Spawning enemy placements vary slightly between attempts
Resistance 2
Campaign encounters are set pieces
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Delta Force: Black Hawk Down
Loadout choice and mission routes are learnable
Resistance 2
Exotic weapon choice and class co-op roles add 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.