ethereum biggest contender is binance coin.. bnb has a big potential as well as those in the top 10 list.. but the thing about this ethereum even though there are a lot of coins out there it seems that eth is so popular..
I doubt it.
BNB is only an exchange based coin but Ethereum is not. Binance has tried everything to drag Ethereum down but has always failed miserably.
I still feel NEO can be a potential Ethereum killer, it is a Chinese backed project and is known as Chinese Ethereum but the development has not been up to track.