You are right that Ethereum is a good coin and investment here can be very profitable. Ethereum's momentum is also very good, if the market goes up even a little bit, then Ethereum can see a nice significant increase, but in my opinion one coin should never be trusted in crypto currency market. Bitcoin is the only crypto currency you can trust and is leading the market. Apart from Bitcoin, if you want to invest in any other crypto currency, you should always divide your capital into different coins. This way you can minimize your risks. Well, there are risks in every trade, but how we minimize these risks is an important factor.