I believe that Etherium is the king of altcoins until now. As you can see the price is very high compared to any altcoins ETH 0rice is very high. I think ir will continue to increase more.
yes for now ethereum is the largest altcoins and has a high price but with current ethereum problems it can affect its popularity in the future, if ethereum doesn't solve it soon, I'm here talking fees
BNB is now starting to grow and has very cheap fees, maybe this will be the toughest competitor or maybe it can overtake ethereum in the future