From the look of things so far in the market, you are right with your suggestion about ETH. ETH has had a London hard fork which saw it increasing in price while attracting more attentions which is very vital to its growth, in addition the forthcoming Ethereum upgrade (ETH 2.0) is another factor which will bring more attention, users and investors to ETH, and the more this is happening, as more people keeps anticipating it, Ethereum will be in the minds of people thus making it a good pick or better option than BNB.
However, BNB is a good coin and owing to the fact that the team loves ideas which will keep making their exchange worth it, BNB will always remain a valuable coin as well. Nevertheless, with the current issues or news surrounding BNB seems to be what is making it look sidelined from the market, but on the long run it is still a good coin.