There are a lot of coins that worth to consider and has some advantages which bitcoin doesn't has. Not only ethereum, there are Dash, Monero, Augur, Zcash, byteball DigixDAO. Well, you can check on https://coinmarketcap.com/ about coins marketcap, price, available supply, volume (24h) and the graph. You should read those coins white paper and people review about it, and you may find an alternative coin to invest, check my signature to vote your favourite coin.