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 · Pure Mechanics
Console shooter execution across scripted set pieces and once-massive human multiplayer.

Execution · Competitive PvP
Punch timing and counter prediction in movie-licensed boxing.
Resistance 2 leans Execution (Pure Mechanics); Rocky Legends leans Execution (Competitive PvP).
Resistance 2 leans a little harder on execution, though the gap is small.
Resistance 2
Weapon handling and boss dodging demand console-shooter precision
Rocky Legends
Punch timing and blocking windows carry every exchange
Rocky Legends leans a little harder on reads, though the gap is small.
Resistance 2
60-player multiplayer rewarded reading humans; campaign Chimera don't adapt
Rocky Legends
Human opponents feint and bait counters in versus
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Resistance 2
Campaign encounters are set pieces
Rocky Legends
Little randomness beyond minor damage rolls
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Resistance 2
Exotic weapon choice and class co-op roles add planning
Rocky Legends
Training allocation and counter knowledge are plannable
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.