One of the best strategy to invest, hold and earn passive income while dealing with cryptocurrencies is to hold more coins instead of holding only just one coin. ETH and BNB are both on my portfolio, I still have more. If comparing both, they have their own blockchain with different tokens and they are well known, if the next bull run starts, they will both increase. I checked their price and ATH, they both are not that volatile unlike many other altcoins, they are both worth buying.
I also added the two coins in the portfolio because the pattern of price movement follows the market flow so when the market decreases both lose value, but it would be nice to see the market increase as the two compete with each other on increasing the portfolio value.