CNN has bias that fluctuates wildly toward the perceived flavor of the week; it operates for maximum sensationalism. It basically invented the 24-hour news cycle and hasn’t altered its formula for decades.

CNBC is business news; did you mean MSNBC?

MSNBC has the least viewership of the three and I would not consider it particularly influential. It is biased towards a minority ultra-Democrat position, hence its relatively lower viewership due to its fringe editorial content.