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
Slow-motion gunfights against aggressive but ultimately mappable squad AI.

Execution · Pure Mechanics
Grapple and reversal timing with light mindgames against human opponents.
F.E.A.R. 3 leans Execution (Practiced Mastery); WWF SmackDown! Just Bring It 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.
F.E.A.R. 3
Slow-mo gunplay still rewards fast accurate aim
WWF SmackDown! Just Bring It
Grapple timing and reversal windows decide matches
WWF SmackDown! Just Bring It leans a little harder on reads, though the gap is small.
F.E.A.R. 3
Squad AI flanks convincingly but follows mappable routines
WWF SmackDown! Just Bring It
Human opponents invite light reversal mindgames
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
F.E.A.R. 3
Encounter layouts are scripted-but-unknown first time
WWF SmackDown! Just Bring It
Weapon spawns and AI interference add small chaos
F.E.A.R. 3 leans a little harder on optimization, though the gap is small.
F.E.A.R. 3
Cover usage and power timing are quickly learned
WWF SmackDown! Just Bring It
Move-set knowledge and match-type tactics are quickly learned
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.