head to head
Counter-Strike: Global Offensive asks more than Battlefield 3, and the gap is execution.

Execution · Competitive PvP
Large-scale modern combined-arms shooter built on destructible maps and squad teamwork.

Execution · Competitive PvP
Definitive competitive tactical FPS balancing aim mastery with team strategy.
Battlefield 3 leans Execution (Competitive PvP); Counter-Strike: Global Offensive leans Execution (Competitive PvP).
Counter-Strike: Global Offensive leans clearly harder on execution.
Battlefield 3
Gunplay, suppression management, and vehicle piloting
Counter-Strike: Global Offensive
Spray control and flick precision at the top
Counter-Strike: Global Offensive leans clearly harder on reads.
Battlefield 3
Human teams adapt routes and armor pushes
Counter-Strike: Global Offensive
Anti-stratting and mid-round adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield 3
Spawns, destruction, and vehicle drops shuffle engagements
Counter-Strike: Global Offensive
Information hidden until contact
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield 3
Unlock paths, class synergy, and map control
Counter-Strike: Global Offensive
Utility lineups, economy, and default strats
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.