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
WWII team shooter blending aim and squad tactics.

Execution · Grand Arena
Hero shooter with team-up ability synergies.
Battlefield V leans Execution (Competitive PvP); Marvel Rivals leans Execution (Grand Arena).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield V
Bullet drop and recoil punish sloppy aim
Marvel Rivals
Hero aim and ability timing
Marvel Rivals leans a little harder on reads, though the gap is small.
Battlefield V
Flanks and squad play reward map sense
Marvel Rivals
Team-fight cooldown trading is prediction
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield V
Vehicle spawns and chaos create swings
Marvel Rivals
Map and team comp roll affects
Marvel Rivals leans a little harder on optimization, though the gap is small.
Battlefield V
Class loadouts and fortifications optimize holds
Marvel Rivals
Hero synergies and team-up combos 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.