ethereum, if my recommendation is safe even if the price increase has started to slow. its safe because almost 90% ico manufacture using ethereum platform, so ethereum in my opinion is still good enough for long term.
Yes, I really agree with you.Ethereum has a good platform and smart contract so ethereum can survive until now and of course has been very popular and has a lot of fans.So ethereum is still worthy of being a long-term investment because altcoin is very potentially good in the future front.
I also think ethereum is the best altcoin because it is easier to access and you can convert easily than other crypto. And the ethereum is next to bitcoin so its amount is good.