You know the superiority of one platform over another sometimes doesn't matter. As long as developers keep building on, let's say, ETH, these platforms only stand as niche. That said, BSC has existing projects, and only 20s have volume. This is a chain backed by the king "Binance."

Polkadot seems "untested" at the moment, and they will have a bigger challenge than BNB.

POS (or anything that involves staking) = centralized, end of story.