What was the difference between ideology of Satya Shodhak Samaj and Prarthana Samaj?

What was the difference between ideology of Satya Shodhak Samaj and Prarthana Samaj?
Satya Shodhak Samaj was founded by Mahatma Jyotiba Phule on 24 September 1873 with an objective to liberate the Shudras and Ati Shudras and to prevent their ‘exploitation’ by the upper caste like ruling caste Maratha. Satya Shodhak Samaj refused to regard the Vedas as sacrosanct, opposed idol worship, denounced the chaturvarnya system (the caste system) and rejected the need for a Brahman priestly class as educational and religious leaders. The existence of God was replaced by Nirmik. Deenbandhu was the name of mouthpiece of the Satya Shodhak Samaj.

The main difference between the orientation of the Brahmo Samaj or Prarthna Samaj and Satya Shodhak Samaj was that, while the former two wanted a Social Evolution, the later wanted a Social Revolution. The former two had more intellectuals while the later one had come in contact with the masses more deeply. A drum in the hand and Dhoti, Turban and blanket was the dress of the preachers of Satya Shodhak Samaj.