yes, bnb is one good alt to buy and detained. I've followed AirDrop the previous time bnb coins ico I do not think this project will be successful as it is now binance is the best trade and exchange binance reliable. bnb coins will be more expensive and valuable in the future.
Saying BNB will be more expensive in future is not a surety, anything can happen. With the current development which is massive, we expect that of course but not certain. By the way Ethereum remains best altcoin, not BNB.