Is regular savings plans or roboadvisor (looking at endowus) better?

Depends what do you mean by better. by common understanding, you can also do RSP with robos. should at least know what are their underlying funds (or products), is it in line with your objectives, fee structure, investment style etc.

common misunderstanding is robos are cheaper. it is, if all other things being equal. these days there are advisors who charge one off sales charge, whereas robos' fee will proportionately increase as your portfolio grows. you have to see your own overall picture.

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Roboadvisor is better since savings plan tend to have middle-man cost.

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Roboadvisor has low cost and have similar savings plan advantages and less rigid.

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You can always choose a low risk option in your roboadvisor