Fire and Fuel

ekAdashI samutthena vahninA pAtakendhanam.h | 
bhasmI bhavati rAjendra api janmashatodbhavam.h 

With the ekAdashI as fire, and sin as fuel; [the latter] gets incinerated, 

O King, even if it be obtained of hundreds of lifetimes (From Bhaghavatam). 

Therefore, while other actions can bring some benefits, none of them quite matches up to the power of an ekAdashI in terms of removing the accumulation of sins, which brings one misery.