I'm pretty worried about the imminent BTC hard fork.
I would bet big on ETH (as I have), as all evidence points to the flippening. But how much growth is left? I can't say...
Steem though.. that is my newest interest. It has a fully working product with users. How did I not know about it until yesterday!?
If you like Steem, check out Bitshares and the upcoming EOS. Both by the same guy that created Steem. At some point after the flippening, there might be a reflippening, with one of these platforms being the reflippenees.
I asked myself the same question re Steem a month ago. BTC very interesting, my mentor assures me the tech behind it is > eth tech.