head to head
PUBG Mobile asks more than Battlefield 4, and the gap is variance.

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

Execution · Grand Arena
Battle royale survival blending aim, rotation planning, and heavy circle-and-loot RNG.
Battlefield 4 leans Execution (Competitive PvP); PUBG Mobile 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 4
Gunplay, vehicle mastery, and movement under fire
PUBG Mobile
Touchscreen aim and recoil control set the ceiling
PUBG Mobile leans a little harder on reads, though the gap is small.
Battlefield 4
Human teams adapt to flanks and levolution chokes
PUBG Mobile
Outguessing rotations and third-party timing of human squads
PUBG Mobile leans clearly harder on variance.
Battlefield 4
Map-altering events and spawns inject noise
PUBG Mobile
Circle placement, loot and drop locations dominate single matches
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield 4
Loadout tuning and objective rotation knowledge
PUBG Mobile
Zone rotation theory and loadout priorities are well mapped
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.