I know many people will choose Dollar-cost averaging because it has some advantage over the Lump sum style. DCA helps to spread your investment risk and it also makes people invest conveniently without much pressure. It could also help to reduce bad timings of purchases. I see this DCA as little drops of water that can fill a bucket with time. But you cannot avoid lump sum strategy especially when the bitcoin price is low. I have been adopting DCA  for some time now but whenever bitcoin price is down and I have the money to buy, lump sum strategy will be my best option. Generally, DCA is the best option for newcomers who have little or no knowledge about the movement or operations of the market. However experienced bitcoiners can benefit from the market using the lump sum strategy. So there is a need to be flexible in your investment plan and not stick to one strategy, but always do your research before taking any decision.