I prefer BNB for now. Indeed the high Fees on the Ethereum network are a problem for me doing small transactions. Therefore I think BNB is the best right now. But that doesn't mean we have to switch from ETH because there are indeed many projects running on the ETH network and that (high fees) remains a problem that needs a solution.
The two coins are not the best choice, if you can choose to take action by investing in BNB and ETH so much the better. you can analyze a lot from the two virtual currencies. if you talk about large gas costs you should be taught not to cash out in the near future on the coins you have.
BNB gas fees are way far than ETH gas fees. I don't see the sense of not cashing out in the future. Even if ETH gas is ridiculously high, there are many reason why people are transacting on ethereum and majority of them are by earning profit more than the gas fees they have paid. Though there are instances that these gas fees are the one who blocks us in doing transactions because most of the time it's not worthy paying the high gas fees. I have ETH in my wallet but I treat it as an investment but if there's a point that I can get a massive profit from my investment, I won't be bothered by the high fees as long as I get the profit that I want. But yeah, cheap and fast alternatives are better.