head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Pure Mechanics
A 1977 timing test - lead the moving target and outscore the other gun.

Execution · Pure Mechanics
Cover-shooter aim and QTE timing through scripted film setpieces.
Air-Sea Battle leans Execution (Pure Mechanics); James Bond 007: Quantum of Solace leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Air-Sea Battle
Timing shots on moving targets is the entire game
James Bond 007: Quantum of Solace
Cover shooting and quick-time events run on aim and timing
James Bond 007: Quantum of Solace leans a little harder on reads, though the gap is small.
Air-Sea Battle
Head-to-head play adds slight outguessing of the other gunner
James Bond 007: Quantum of Solace
Multiplayer adds modest human prediction; campaign is scripted
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Air-Sea Battle
Target patterns cycle predictably
James Bond 007: Quantum of Solace
Setpiece encounters repeat identically
James Bond 007: Quantum of Solace leans a little harder on optimization, though the gap is small.
Air-Sea Battle
Learning target speeds and angles is shallow but real
James Bond 007: Quantum of Solace
Weapon choice and cover routes are shallow systems
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.