Hold it. It will surely follows bitcoin price and will be second to bitcoin in terms of marketcap.
please hold your Ether because it will soon boom up comparing to BTC, although it depends on individual difference as for me i can only advice you to hold your ether before end of December you will be amazed with what you will with ether price or rate.
It is too soon to sell out the whole amount of Ethereume specially when we know that it is still going to grow up a lot. We are just in the first phase of digital currencies so for making the most out of these assets we need to hold on for at least 2 to 3 more years.
However I think he must buy few Bitcoin also as they can give him the most profit within a very small period of time. Anyways, holding on is the right choice for now.