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
A class-based shooter testing approachable aim and counter-picking against human teams.

Execution · Pure Mechanics
Console shooter execution across scripted set pieces and once-massive human multiplayer.
Plants vs. Zombies: Garden Warfare leans Execution (Competitive PvP); Resistance 2 leans Execution (Pure Mechanics).
Resistance 2 leans a little harder on execution, though the gap is small.
Plants vs. Zombies: Garden Warfare
Third-person aim and ability timing carry every fight
Resistance 2
Weapon handling and boss dodging demand console-shooter precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Plants vs. Zombies: Garden Warfare
Human opponents flank and juke in class-based skirmishes
Resistance 2
60-player multiplayer rewarded reading humans; campaign Chimera don't adapt
Plants vs. Zombies: Garden Warfare leans a little harder on variance, though the gap is small.
Plants vs. Zombies: Garden Warfare
Sticker pack unlocks randomise progression, not matches
Resistance 2
Campaign encounters are set pieces
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Plants vs. Zombies: Garden Warfare
Class counters and objective timing reward team planning
Resistance 2
Exotic weapon choice and class co-op roles add planning
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.