I think Ethereum, but locking the investment in one coin for a whole year is a limitation by itself.
But you will gain for sure, so it's still a good call.
I believe we might see something that will replace Ethereum within a year. I am betting on ICON or WANCOIN. But no one knows.
Ethereum has grown alot although you can make profit there but it isnt like the new altcoins that can make you more profits in the future. Icon and Wanchain is a good pick i expect a massive gains after this two alts especially wanchain is the most awaited alt to be added in exchange while icon was still cheap in my opinion.