ETH is always a very useable platform with a considerably huge community backing it up, and as bitcoin's long time rival, it's good to invest in it. EOS is also a good bet. It beats up bitcoin and ethereum when it comes to speed and scalability. Another good platform is NEO. I hold it since holding it gives me extra GAS. It is more like ETH, but transactions here are free, unlike with ETH that is painstakingly high, and I guess, it's more functional than the latter. Stellar is one of the best also. It is also a decentralized blockchain like bitcoin and partners with IBM. It offers high-scalable or super-fast transactions per second with zero fee. NEM is also a good catch. While bitcoin miners throw huge fund to keep it alive every single day, NEM harvesters, on the other hand, don't have to do that. These five platforms are good to dive in, especially nowadays that the market is experiencing massive depression.