Does it make a difference whether you do lump sum or DCA for robo-advisors?

Let me offer an alternative view. Say you already have the money to do either lump sum or DCA, which will you choose?

Lump-sum is good if you can time the market. It can be TA or fundamentals based, or even just a flat out algorithm like this: "IF portfolio drops 5% from last high, BUY more". Basically, it involves work on your part, so you want to invest because of you.

If you don't want to do any of these, or don't know how, then you do DCA. That's just passively putting more in every month without you controlling. You want to invest in spite of you.

If you lump-sum every 6 months - where does the lump-sum come from? If you set aside 20% of your salary each month for investment, your 6-month lump-sum will also be 20% of your 6-months' salary.