Bitcoin and Ethereum are the best for trading. But there will be one more big train this summer and it's called Polis. Right now it's at a extremely low price, but once the Olympus Protocol will be released we will see this coin in top 25. And it's extremely easy to mine.

https://coinmarketcap.com/currencies/polis/


Always do your own research if you don't want to miss the next big train!