Both coins are potentially profitable to hold,bitcoin is they leading coin in crypto market,then Ethereum is an altcoin which will lead they crypto market,Ethereum has added in value in a very short period of time making it they second coin in they crypto market
For me as all bitcoin is the first choice because we really need to have it these days when almost everyone is using crypto currency instead of fiat, bitcoin is being important as payment method but we never hear about ETH as payment so I think instead of wasting time reading about ETH we should buy some bitcoin as now a day price of bitcoin is really good, not too high we can buy it easily without any price issues, I choose bitcoin because it has high profit for us.