No one forces you to favor nor buy Bitcoin than those you mentioned but what I am seeing ? is that you are just shilling for those coins that stays in your folio and not the truth about Bitcoin.
Yes maybe Binance and Eth is a good choice but the safest? I'm afraid you can find any coins safer than Bitcoin.
so Lets just stay in our investments and lets see what will come in the next 4 years.
Comparing bnb with Bitcoin is just like comparing apple with oranges. BnB is centralized coin that can never compete with decentalized coins like btc, eth etc. 4 years is quite a time, if you invest in btc then you can get good return in year or two as evident from btc historic price chart. Between price of all coins be it eth or bnb are linked with btc. If btc goes up, everything goes up and vice versa.