Ethereum is currently the best choice and altcoin, we hope there will be many new bounties that can raise polka-dots this year I'm not sure ethereum will last forever as the best altcoin, so ethereum can beat bitcoin it's impossible to happen for a long time bitcoin has remained a favorite of Large investors, especially well-known bitcoin companies, have always been the parent of all coins
Both Polkadot and Cardano have their own characteristics. But for all the advantages, none of them has yet managed to displace Ethereum. But you need to be aware that before the full implementation of Ethereum 2.0, it may take years, the situation may change.
Even if Ethereum manages to maintain its place in the market, competitors may find a way to surpass Ethereum