Raja Yogis practise Nirodha-Samadhi. Jnana Yogis or Vedantins practise Badha-Samadhi. In the practice of Nirodha-Samadhi the Raja Yogi stops all the Vrittis of the mind by concentrating on one form. In the practice of Badha-Samadhi the Jnana Yogi abandons all names and forms and takes up the one essence viz., Sat-Chit-Ananda Brahman that is the substratum for all these names and forms.
There is Vyapakata in the Sadhana of a Jnana Yogi. He does Sadhana even while walking. Wherever he sees he tries to see the one underlying essence and rejects the names and forms. He is in Sahaja-Samadhi even while moving. But, a Raja Yogi sits and meditates. He is in need of a steady, definite pose. He cannot be in Samadhi while walking or moving.
By Swami Sivananda