head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is optimization, and it is a single point.

Execution · Twitch Chaos
Flipper execution and table knowledge with Pokémon-catching RNG on top.

Execution · Twitch Chaos
One-touch reflex timing against procedurally generated obstacle streams.
Pokémon Pinball leans Execution (Twitch Chaos); Zombie Tsunami leans Execution (Twitch Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Pokémon Pinball
Flipper timing and nudge control are the whole input
Zombie Tsunami
One-touch jump timing for a growing horde is the whole test
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Pokémon Pinball
A pinball table has no mind
Zombie Tsunami
No opponent - obstacles are procedural
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Pokémon Pinball
Ball physics and catch-mode rolls add real randomness
Zombie Tsunami
Procedural level generation decides what each run offers
Pokémon Pinball leans a little harder on optimization, though the gap is small.
Pokémon Pinball
Mode routing and table knowledge raise scores predictably
Zombie Tsunami
Upgrade spending is a thin meta 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.