For sure Etherium is a very awesome altcoin for long term investment. Its top altcoin in the market. Its a very protensial coin. You can buy it without any doubt.
The fact is that ethereal is much better and cition than Bitcoin. If you pay attention to What are the maximum prices of these coins in 2017, then if the cryptocurrency market recovers and the jellyfish again of these prices, then ethereum will increase my deposits more than Bitcoin.