BNB - an artificially created coin for the simple cause of trading and reducing fees thus attracting more traders to the Binance platform
ETH - A blockchain, not fintech, focussed token that has opportunities for real life use cases build upon.

For a random, trader, both coins are of interest, but as from a sustainable and long term ivnestment point of view, BNB can be neglected. What if CZ makes a mistake or Binance gets hacked? The price will plummet into oblivion