It is true that at the moment BNB seems more promising than ethereum, however it has several problems that would prevent it from being a convenient long-term option: Binance is a business whose main objective is the exchange of cryptocurrencies, so it will continually be subject to review by the authorities, and will be under threat of hackers.

In addition, Binance has an owner and therefore is centralized, since as any company its main priority is to obtain profits for its owner and its investors, which does not happen with ethereum.