It does not matter which option you select as long as you are investing for the long-term.
Both the styles of investing have their pros and cons. It is not necessary SIP gives better returns than lump sum investments or less risky than lump sum investments. In fact, historically seen if you have timed your investments right that is, bought at lowest prices and sold at highest price, lump sum investments will give you the best returns.
To time the market right once is an achievement but to time it right twice well a difficult task. Here is where SIP steps in. Let us have a look at how and why is it better or not and how both investments are similar?
The factors taken are the factors based on which you would invest.
Also read: What if the Sensex falls below 10k? Still invest