If you look at the current conditions, I think ETH is more profitable because there are so many users and it's easy to buy and the market is strong, but the BNB opportunity still exists and there's nothing wrong with having both.
many people give the advice to have both would be better. but if you see a great opportunity to bring profit what would you choose? if I think in the time until the end of this year, ETH will probably be the more profitable one. just my estimate, maybe because I have more ETH than my BNB.