It's best to suggest the newbies to buy bitcoin when they've just got in. The price is quite down as of the moment. but it's not a bad altcoin to suggest to the newbies.
If we notice the chart of crypto market, top altcoins always follow bitcoin rally. Probably op heard about bnb somehow and thats why he is especially asking suggestions about bnb! But if buy bnb instead of btc, that will be also good decision for op, i believe.
It's not only the top altcoins but almost every altcoin is also going with the flow where bitcoin is heading. BNB or BTC, they're both good.
But if it's about the choice, it's always the best choice to go for bitcoin first just like what everyone is saying. You're going to see people tell you to hold bitcoin since the alts that they may suggest probably have been through an ATH as well.