Both buying strategy is good to use on accumulating bitcoin. Personally,i feel that the DCA method give one more opportunity to accumulate more than buying at lump. Although,this also depends on the cash inflow and how consistence it is.

I am someone that i have a regular income on a fixed amount and with this,i have the opportunity to always DCA the moment i get paid,because i have strategise how to use the funds. I have an investment that do pay me annually and what i do at that time is to use 80% of the funds to buy bitcoin at lump,since i can survive without that funds because it is like an extra cash to me.

When i haven't known about bitcoin,i use the cash for loan so that i can get an interest from it,when the time dues. After i got to know bitcoin,i decided not to borrow the money out for 10% interest,but rather i invested it on bitcoin,so that i can get my profit from bitcoin instead in fiat. I intend not to sell off till i have reach my bitcoin target,which when i did my calculation will be in 6yrs time,if there isn't any unforseen obstacle in my bitcoin journey.

I have also put into consideration that should incase i face some challenges along the line of my accumulating period,i will just hodli,till i overcome it. This means that i will take me more than 6-7yrs for me to reach my target bitcoin investment portfolio. If i could look into the future and know when bitcoin price will dip,i would love to keep such funds and buy at a lower price so that i can get more bitcoin but i might end up missing out,if the price didnt dip. With DCA method,you secured and dont need to panic because your investment portfolio is growing. Management is important for a hodler because it will enable him to be flexible with the cash inflow,when to buy and lump and when to DCA and when just to hodli and wait.