it depends on your analysis..always holding is good.if the coin price is down waiting for target price.take the risk.there are so called correction price.
Holding coins especially bitcoins have never ever turned out to be a wrong decision. You are always in profit when bitcoins are taking rides to moon. We all know that bitcoins prices do grow with time and patience do pay us off in the form of enormous profits. Holding is best if you are working with bitcoins.