Ethereum, Ark and Stratis appear to have nice fundamentals for growth.
I agree about investing in ETH. Blockchain have already added support for eth coin. So you can now buy safe eth with btc at the same time. So that means that people want to make eth bigger.
I would invest in eth, but i have already invested in lite coin. LTC is for me the sleeping giant it has the potential to rise.
LTC price seems so strongly correlated with BTC. Investing in either is basically same thing (no longterm LTC/BTC impulse wave).
They experiment more on LTC, so if something is gonna blow up, it will be rather on LTC.