Now the more better to invest is the ethereum than the bitcoin. Last year bitcoin is better but now we are in 2018 and ethereum is best now and i hope you can buy more ethereum to earn more profit.
I have a bit different opinion, because for me best coin is one and only bitcoin, value of bitcoin is getting gaining value, old age has gone when people were not showing trust for bitcoin but now we are well aware of all qualities bitcoin has, so buy some bitcoin as buying Of ETH will not be a good idea, so buy bitcoin and save for long term it will give you huge amount of profit.