head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Execution · Grand Arena
Hero shooter with team-up ability synergies.

Execution · Competitive PvP
Milsim 50v50 team-tactical shooter.
Marvel Rivals leans Execution (Grand Arena); Squad 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.
Marvel Rivals
Hero aim and ability timing
Squad
Bullet drop, sway, suppression test aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Marvel Rivals
Team-fight cooldown trading is prediction
Squad
Squad tactics versus humans demand prediction
Marvel Rivals leans a little harder on variance, though the gap is small.
Marvel Rivals
Map and team comp roll affects
Squad
Minimal RNG, comm-driven outcomes
Marvel Rivals leans a little harder on optimization, though the gap is small.
Marvel Rivals
Hero synergies and team-up combos deep
Squad
Logistics, FOB placement, kit choice deep
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.