I would put money (and have put money) on Ethereum, Monero, and Basic Attention Token. If you really want to gamble (and I mean high high high risk, high high high reward) look into shift. They have a stellar project that has a working product, but their team can miss deadlines, and apparently they thought that storing all of their development funds on an unsecured computer was smart. I think they have learned their lesson from this super f-up but only time will tell. If you have some extra cash you were going to spend on a collectors edition beanie baby that will triple in value in 1996 maybe spend that money on shift instead.