Of all the pradosha’s Shani Pradosh and Soma Pradosh are considered to be important. Sani Pradosham is the Pradosha Vrata falling on Saturday. And Soma Pradosh is observed when Pradosha falls on a Monday.
Maha Pradhosh is the Pradosha which falls before Maha Sivarathri in the month of Maagha in traditional Hindu Calendar.