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.
I very much agree that the story of centralization is indeed almost over. What belongs to the future should be decentralization, giving power to users, and centralization will stop doing evil.
Dot is bound to be the future, because he has solved many problems and is truly in line with the future development of blockchain.