the most valueable altcoin is ethereum then Binance coin my friend
and there is no big issue on ethereum fees anymore because now as we can see the fees on ethereum transactions getting lower right ?
Before there is an issue to ethereum's fee but it's solved and finally calmed down. BNB is a good choice if you're using their exchange too.
You'll check lower fees in trading and also with its BSC, there are a lot of incentives and markets that you can enter too.