Japanese cards are generally better for quality, rarity, and resale value due to superior print, exclusive promos, and high global demand
Notably, opponents can't try to remove cards from your graveyard or Foods you control to stop you from foraging
They are played in many formats, such as Vintage or Old School, but also in Commander
Theyre either stronger or more flexible, opening the way to more complicated combos
[1] It also most likely created nearly all of Yuya's other Pendulum cards, as he is seen using them before Leo Corporation started producing them
That means you can rotate elements of the deck to fit your playstyle, or try out new cards to find some synergies, while the Partner mechanic lets you play a pair of Commanders