PoS coins rank much lower when compared to the PoW cryptocurrencies, because they offer less safety. Also, these coins have a bias towards wealthy users, as the more coins you own, the more you can earn from staking. Chances of hacking and theft are much more present with PoS coins such as Cardano, when compared to proper cryptos such as Bitcoin. And this is exactly the reason why during the last 11 years, none of the PoS coins have managed to offer competition to BTC in terms of user base or acceptability.