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
Large-scale modern combined-arms shooter built on destructible maps and squad teamwork.

Execution · Pure Mechanics
A competitive kart racer testing drift-boost execution against human rivals.
Battlefield 3 leans Execution (Competitive PvP); Crazyracing Kartrider leans Execution (Pure Mechanics).
Crazyracing Kartrider leans a little harder on execution, though the gap is small.
Battlefield 3
Gunplay, suppression management, and vehicle piloting
Crazyracing Kartrider
Drift-boost timing and tight cornering define lap speed
Battlefield 3 leans a little harder on reads, though the gap is small.
Battlefield 3
Human teams adapt routes and armor pushes
Crazyracing Kartrider
Reading rival lines and item timing matters in PvP
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
Crazyracing Kartrider
Item pickups add some randomness to races
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
Crazyracing Kartrider
Track lines, drift chaining, and item usage are solvable
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.