Bitcoin versus Ethereum: Which one should you buy when the bull market returns

Bitcoin and Ethereum rank #1 and #2, respectively by market cap
Bitcoin is a digital version of currency while Ethereum powers smart contracts
Both cryptocurrencies are attractive in a bull market
Bitcoin and Ethereum rank as the biggest cryptocurrencies. To an investor, deciding which one to buy can be confusing. However, it should be easy if you understand the role that each plays in the crypto evolution. 
Bitcoin (BTC)
Think of Bitcoin (BTC/USD) as a digital version of your local cu