I have started with coinbase and coinbase pro. The nice thing with coinbase that I can put away a set amount in BTC every Friday. But that was not enough - coinbase is rather limited so I opened an account at Kraken and Binance.us as well. I can keep some FIAT money in Yen at Kraken and as for trading, Kraken is the better choice (this is only my opinion). I can even play on the weekends...