head to head
Neither is simply harder - they are hard in different places. Gigantic: Rampage Edition demands more execution; Pokémon UNITE demands more variance.

Execution · Grand Arena
A team-based hero shooter testing aim, prediction of opponents, and objective coordination.

Reads · Mind & Math
Pokémon MOBA with team-scoring objectives.
Gigantic: Rampage Edition leans Execution (Grand Arena); Pokémon UNITE leans Reads (Mind & Math).
Gigantic: Rampage Edition leans clearly harder on execution.
Gigantic: Rampage Edition
Aiming abilities and dodging in real-time hero combat matters
Pokémon UNITE
Auto-attack and ability inputs are forgiving
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Gigantic: Rampage Edition
Predicting human teammates and enemies drives 5v5 outplays
Pokémon UNITE
Team-fight engagement timing is prediction
Pokémon UNITE leans clearly harder on variance.
Gigantic: Rampage Edition
Little randomness; outcomes hinge on team play
Pokémon UNITE
Wild Pokémon spawns and item RNG
Pokémon UNITE leans a little harder on optimization, though the gap is small.
Gigantic: Rampage Edition
Ability upgrades, objective control and team comp planning
Pokémon UNITE
Held items and route planning 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.