Man, this is one of those questions where I feel like the 'best' site totally depends on what kind of reader you are. For me, the ideal has shifted from wanting a giant hub to craving a place with a real sense of community. I used to rely on NovelUpdates for everything, and it's still unmatched for its sheer database of translated works, especially for Asian fantasy and webnovels. But the update tracking there can be a mess. You'll see a series marked as 'ongoing' but the last forum post was two years ago because the fan translation group just ghosted everyone. That's the worst feeling—falling in love with a story that just vanishes into the ether.
Lately, I've found myself sticking more to the official source when I can. If it's an English-original serial on Royal Road, I'm just following it directly on the platform, because the update schedule in the author's bio is actually accurate, and you get the author's notes and comments right there. It feels more immediate. For big Korean platforms like KakaoPage or Munpia, unless you can read Korean, you're at the mercy of the translation groups, and that's where a well-moderated Discord server for a specific novel becomes priceless. Someone always posts the raw update news, and the translator might give ETA updates. It's more fragmented, but the information is way more reliable than a third-party aggregator. So I guess my current method is a patchwork: Royal Road for English stuff, NovelUpdates as a discovery tool and to check if a translation is even active, and then hopping into a Discord if I'm really invested. It's not elegant, but it works.