ETH is bound to keep growing an maintain the 2nd place after BTC. More projects are based on the Ethereum platform and using the currency to fund their ICO's. So as of this moment it would be the "safe" option as it's well established on the market with a huge following.

If you're new to the market I would suggest you to read up on the top 10 coins and gain a understanding of how they work and take it from there, and when you start investing, diversify your investment between at least 5-10 different project.