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
Cops-and-robbers spin on Battlefield built around heists, chases, and urban shootouts.

Execution · Competitive PvP
Hardcore team shooter where one bullet kills and the HUD tells you nothing.
Battlefield Hardline leans Execution (Competitive PvP); Insurgency leans Execution (Competitive PvP).
Insurgency leans a little harder on execution, though the gap is small.
Battlefield Hardline
Close-quarters gunplay and high-speed vehicle chases
Insurgency
One-shot lethality rewards precise aim
Insurgency leans a little harder on reads, though the gap is small.
Battlefield Hardline
Cops-versus-criminals humans adapt heist tactics
Insurgency
Human squads flank and adapt each round
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield Hardline
Spawns and loot grabs shuffle engagements
Insurgency
No killcam or HUD hides enemy positions
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield Hardline
Gadget loadouts and mode-specific route knowledge
Insurgency
Loadout points and objective route knowledge
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.