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 · Pure Mechanics
A tennis simulation testing shot execution and reading opponent positioning.
Resistance 2 leans Execution (Pure Mechanics); Tennis World Tour 2 leans Execution (Pure Mechanics).
Tennis World Tour 2 leans a little harder on execution, though the gap is small.
Resistance 2
Weapon handling and boss dodging demand console-shooter precision
Tennis World Tour 2
shot timing, positioning, and precision control
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Resistance 2
60-player multiplayer rewarded reading humans; campaign Chimera don't adapt
Tennis World Tour 2
human opponents adapt shot placement
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
Tennis World Tour 2
minor ball-physics unpredictability
Resistance 2 leans a little harder on optimization, though the gap is small.
Resistance 2
Exotic weapon choice and class co-op roles add planning
Tennis World Tour 2
minor player/equipment choice
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.