For me it's Polkadot and Binance Smart Chain, both of them are been called the next Ethereum, in terms of community these two have been able to grow a huge fan base in the past recent months,although my favorite is Binance Smart Chain, it grew from just being just an exchange blockchain to one of the most used blockchain today, and no doubt since the ETH gas fees became high Binance Smart Chain has benefited alot because investors moved over to bsc projects since they don't need much fees to carry out a transaction.