One that could solve some real problems and it's not only coin. One that is already used for real use cases. One which does not suffer from hyperinflation. And it's not only one.
I see eth as a good investment. I started to be fascinated by Steem. Then the ones for sharing resources: maid, storj, sia, golem, etc. Proof of research ones like gridcoin, foldcoin,...
I'm also looking in investment funds like iconomy and taas. A better way to spread risk instead of managing yourself n wallets in different currencies.
The list could continue. The whole blockchain industry is going to grow. It could be the web 3.0, who knows?