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I chose both, although they are almost similar but also very different, the most basic thing is the transaction fee, BNB is cheaper than ETH. Therefore, there are far more BNB users, but on the other hand, ETH users contain whales. The ecosystem is also the same, nothing is different.
Both have different preference for me and of am not mistaken others will have a similar choice in mind with both coins, e.g if am doing a large transfer then I will choose BNB over ethereum since bnb smart chain have lower fees and faster transaction time compared to ethereum. But both are good for long-term holding.