from my point of view, then of course I choose BNB as the next ETH, because BNB is ranked 4th while ETH is ranked 2nd, so that makes BNB a tough competitor to ETH and has a chance to become the next ETH, although I personally support ETH and believe that ETH will always be the most popular of any altcoin.
It is still very difficult to happen to BNB because whatever BNB will develop to compete with ETH in the crypto space, ETH will still be where it is now because ETH also has its own development in the crypto space and BNB will remain BNB, as well as ETH, so the two of them will not interchange.