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
Hardcore team shooter where one bullet kills and the HUD tells you nothing.

Execution · Competitive PvP
Frantic small-arena duels testing reflexes and prediction of human opponents.
Insurgency leans Execution (Competitive PvP); Superfighters Deluxe leans Execution (Competitive PvP).
Insurgency leans a little harder on execution, though the gap is small.
Insurgency
One-shot lethality rewards precise aim
Superfighters Deluxe
Aim, blocks, throws and movement decide frantic small-arena fights
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Insurgency
Human squads flank and adapt each round
Superfighters Deluxe
Human opponents constantly adapt positioning and weapon timing
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Insurgency
No killcam or HUD hides enemy positions
Superfighters Deluxe
Random weapon spawns and destructible chaos shuffle fights
Insurgency leans a little harder on optimization, though the gap is small.
Insurgency
Loadout points and objective route knowledge
Superfighters Deluxe
Map knowledge and weapon priorities are a thin layer
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.