I think they're all pretty impressive, and could easily get out of hand quickly on the battlefield
A Psychic type Pokemon, Iron Valiant ex doesnt have quite the devastating moveset that Roaring Moon ex has access to, but it does have an Ability that allows you to add two damage counters (thats 20 HP) to any of your opponents Pokemon
Astral Radiance still seems like a good set to open, especially considering that these are the first versions of many cards connected to Pokmon Legends: Arceus
If any cards have the keywords at the start of your turn, activate their abilities now
Understanding how rare the grade is for that card adds context to the price
In the current era of Magic, where cheap interaction is king, cards like this can really smooth out your game plan