Ethereum is a good coin worth investing. With time the price would probably rise.  But I don't think it will reach the price of bitcoin or its popularity. Also, we are talking here on two different concepts that shouldn't be compared.
Many are expecting for som coin like bitcoin to appear again, some think Ethereum could be that another special coin but I don't think that it will happen twice that some coin will reach the value, adoption and popularity like bitcoin.
If you want some diversity and to split your portfolio invest in Ethereum too but don't expect to profit that much like with bitcoin.