Ooh, I think our very first one was Spirited Away, which is the case for a lot of people, but aside from that, it was YGO Duel Monsters!
Spirited Away remains timeless and classic, but there's not as much to pull from it or create new thoughts on, whereas ygo dm is like, 228 episodes or something. So obviously there's a lot more there by sheer volume. And we still like ygo dm a lot but don't think about it Too Much these days.