SIPs can offer much higher returns than RD. Your mutual fund will determine the return you receive on your SIP. There are two types of mutual funds: equity mutual funds and debt mutual funds. Mutual funds are not like RD in that the rate of return can be adjusted. Debt funds are often more profitable than RD, and they are also considered low-risk. You should consider setting up a SIP in equity mutual funds with higher risk if you are willing to take on more risk.