Speaking in an interview, Singh said, "Congress was different from other parties which are run by political families including the SP."
"There is a difference (between two parties). In Congress Rahul Gandhi talks of internal party democracy. The party holds polls, there is a war room to tackle situations, there is a core committee to take decisions," Singh was quoted by news agency as saying.
"It is not where the party president says something and the next day the exact opposite of what he had said happens. This gives out a bad image of party because it affects political credibility of the party," Singh said.
Singh also ruled out joining for Bahujan Samaj Party (BSP).
Replying to a question about BSP, he said, "There was no question of going to BSP ever."
However, he suggested that he could do business with the Mayawati-led party for carving out smaller states from Uttar Pradesh.