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 · Competitive PvP
Milsim 50v50 team-tactical shooter.

Execution · Competitive PvP
Class-based team shooter with deep mind games.
Squad leans Execution (Competitive PvP); Team Fortress 2 leans Execution (Competitive PvP).
Squad leans a little harder on execution, though the gap is small.
Squad
Bullet drop, sway, suppression test aim
Team Fortress 2
Projectile aim and rocket jumps reward hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Squad
Squad tactics versus humans demand prediction
Team Fortress 2
Spy/sniper duels are pure prediction
Team Fortress 2 leans a little harder on variance, though the gap is small.
Squad
Minimal RNG, comm-driven outcomes
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.
Squad
Logistics, FOB placement, kit choice deep
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.