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
Massive persistent-war FPS where hundreds of players contest continents simultaneously.

Execution · Competitive PvP
Open-zone gunfights where aim, ambush prediction and gear economy all matter.
PlanetSide 2 leans Execution (Practiced Mastery); Stalcraft: X leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
PlanetSide 2
Gunplay and vehicle piloting at FPS standards
Stalcraft: X
Gunfights against other stalkers reward raw aim and movement
Stalcraft: X leans a little harder on reads, though the gap is small.
PlanetSide 2
Human enemies adapt, diluted across hundreds
Stalcraft: X
Open-zone PvP means predicting ambushes from adapting humans
Stalcraft: X leans a little harder on variance, though the gap is small.
PlanetSide 2
Massive battles produce constant chaos
Stalcraft: X
Anomalies, artifact spawns and who you meet inject randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
PlanetSide 2
Loadouts, terrain, and territory strategy matter
Stalcraft: X
Gear economy, artifact builds and route knowledge compound
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.