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

Execution · Practiced Mastery
A competitive puzzle mashup combining Puyo Puyo chains with Tetris stacking.
Battlefield 4 leans Execution (Competitive PvP); Puyo Puyo Tetris 2 leans Execution (Practiced Mastery).
Puyo Puyo Tetris 2 leans a little harder on execution, though the gap is small.
Battlefield 4
Gunplay, vehicle mastery, and movement under fire
Puyo Puyo Tetris 2
fast precise piece placement under pressure
Battlefield 4 leans a little harder on reads, though the gap is small.
Battlefield 4
Human teams adapt to flanks and levolution chokes
Puyo Puyo Tetris 2
human opponents bait garbage and timing
Puyo Puyo Tetris 2 leans a little harder on variance, though the gap is small.
Battlefield 4
Map-altering events and spawns inject noise
Puyo Puyo Tetris 2
piece/bean randomization each match
Puyo Puyo Tetris 2 leans a little harder on optimization, though the gap is small.
Battlefield 4
Loadout tuning and objective rotation knowledge
Puyo Puyo Tetris 2
chain-building and stacking theory mastery
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.