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 · Pure Mechanics
Multiplayer-focused Halo with the series' highest movement skill ceiling.

Execution · Competitive PvP
Free-to-play hero shooter where loadout cards customize champions in objective team fights.
Halo 5: Guardians leans Execution (Pure Mechanics); Paladins leans Execution (Competitive PvP).
Halo 5: Guardians leans a little harder on execution, though the gap is small.
Halo 5: Guardians
Thrusters, clamber, and aim raise the ceiling
Paladins
Hitscan aim and ability timing in firefights
Paladins leans a little harder on reads, though the gap is small.
Halo 5: Guardians
Arena ranked play is human-versus-human
Paladins
Human teams flank, bait ults, and adapt
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Halo 5: Guardians
Spawns and REQ Warzone randomness
Paladins
Card draft order adds mild run variance
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Halo 5: Guardians
Movement routes and weapon timers
Paladins
Loadout card builds and item counter-buying
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.