Both cryptocurrencies are very popular and most likely the most popular among altcoins and in general I constantly invest in both cryptocurrencies because both cryptocurrencies are very actively developing and constantly reaching new heights, but I do not like that transactions through the Ethereum blockchain cost a lot of money and therefore I prefer Binance Smart Chain and hopefully in the future BSC will really be able to overtake the Ethereum blockchain, but so far, of course, I can't believe in it.
It is true that these two altcoins are more in demand as they are in the second and third positions in crypto. ETH has been proven with its wide market but high fees are a major problem for it, whereas Binance has much cheaper fees and this makes ETH holders choose Binance as an alternative while waiting for the settlement of fees on ETH, it is often said that Binance will replace Ethereum. But for me neither, both will go hand in hand in the crypto market.