I'm not pulling Bitcoin here, out of the three alt coins you mentioned I'd vote Ethereum first then BNB. I'm leaving it out because of the uncertainty and criticism surrounding XRP. Both ETH and BNB coins are good for investment. If there is any coin after Bitcoin it is Ethereum. To my knowledge ETH and BNB are indeed well-established and popular coins in the cryptocurrency space. Both have strong use cases and a large network of supporters. I think holding BNB and Ethereum as an investment could yield good results in the future.