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
Combined-arms multiplayer shooter famous for map-altering levolution moments and 64-player conquest.

Execution · Competitive PvP
Punishing asymmetric Vietnam shooter where positioning beats twitch reflexes.
Battlefield 4 leans Execution (Competitive PvP); Rising Storm 2: Vietnam 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.
Battlefield 4
Gunplay, vehicle mastery, and movement under fire
Rising Storm 2: Vietnam
One-shot lethality makes aim and exposure discipline decisive.
Rising Storm 2: Vietnam leans a little harder on reads, though the gap is small.
Battlefield 4
Human teams adapt to flanks and levolution chokes
Rising Storm 2: Vietnam
Predicting human pushes, flanks, and tunnel placements.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield 4
Map-altering events and spawns inject noise
Rising Storm 2: Vietnam
Smoke, foliage concealment, and unseen enemies.
Battlefield 4 leans a little harder on optimization, though the gap is small.
Battlefield 4
Loadout tuning and objective rotation knowledge
Rising Storm 2: Vietnam
Map lanes, commander assets, and role kits are learnable.
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.