Ethereum is a good known project in the cryptocurrency industry. Ethereum (ETH) is a safe cryptocurrency to invest in because eth is the 2nd largest cryptocurrency in the world. So, its so much stable & its price will be increasing.
Of course ETH is a safer asset, just like bitcoin, but some altcoins can bring much more profit with less investment. I know from my own experience, that it's a shame to see the whole market growing and ETH or BTCs growing slower. But if I consider long term investing, I would buy ETH.