Either LC or RC low pass filters can be used for this purpose. Where the LC filter is more efficient than RC filter.
But for basic power supply circuits, LC filters are less popular than RC filters, as the inductors needed for the filter to work efficiently at 50 to 120Hz need to be large and expensive laminated or toroidal core types. However modern designs using switch mode supplies, where any AC ripple is at much higher frequencies, much smaller ferrite core inductors can be used.
To increase the smoothing action using the filter circuit, just one L-C circuit will not be enough. Several L-section filters will be arranged to obtain a smooth filtered output. Once the signal passes through the choke, if there is any fluctuation remains, it will be fully bypassed before it reaches the load by the shunt capacitor because the value of the reactance(XC) of the capacitor is very low compared with the load resistance (RL). The number of ripples can be reduced to a great amount by making the value of the reactance of the choke (XL) greater than Xc at ripple frequency.
To provide precise information about the types and values of the filters, it will be better if you mention few details
1. The type of circuit which you are using for this AC to DC conversion.
2. What is the actual source voltage for this circuit.