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 · Competitive PvP
Precise stick control plus constant adaptation to a human opponent's tactics.

Execution · Competitive PvP
Class-based team shooter with deep mind games.
Pro Evolution Soccer 2019 leans Execution (Competitive PvP); Team Fortress 2 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.
Pro Evolution Soccer 2019
Dribble touch, pass weight and finishing demand precise sticks
Team Fortress 2
Projectile aim and rocket jumps reward hands
Team Fortress 2 leans a little harder on reads, though the gap is small.
Pro Evolution Soccer 2019
Human opponents adapt formations and punish predictable patterns
Team Fortress 2
Spy/sniper duels are pure prediction
Team Fortress 2 leans a little harder on variance, though the gap is small.
Pro Evolution Soccer 2019
Deflections and keeper randomness add bounded chaos
Team Fortress 2
Random crits and spread inject RNG
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Pro Evolution Soccer 2019
Tactics, instructions and set-piece routines reward study
Team Fortress 2
Class loadouts and map routes solvable
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.