Polkadot is one of the top Ethereum alternatives available to us this is why it could become one of the top cryptos in the near future.  Polkadot is a smart contract cryptocurrency which can handle around 1000 transactions per second.  The projects on the Polkadot ecosystem are vetted because there is a limit of parachains slots.

Polkadot has the lowest carbon footprint of any other cryptocurrency.  This makes it a good choice for people and companies hessitant to get into crypto because of the environmental concerns.