'Shark' and 'Fast' pro duke it out again

The heated debate between a "Shark Tank" host and a "Fast Money" trader over the wisdom of dividend stocks entered a second round Thursday.

O'Leary Funds Chairman Kevin O'Leary stuck to his guns on the premise that dividend-paying stocks offered the best investment bank for your buck.

"Seventy-three percent of the S&P returns in the last 40 years came from dividends, not from capital appreciation," said O'Leary, one of the hosts of TV's "Shark Tank."

Read More Dividend stock smackdown: 'Shark' takes on 'Fast' pro

Adami responded by saying that believes dividend stocks provide a false sense of security against the broader market.

"The only safety in dividend stocks is the dividend they pay," he said. "In other words, if the market goes down 5 percent and you have a 3 percent dividend yield, that's your safety right there. It's doesn't insulate them from the broader market."

In May, O'Leary and Private Advisor Group's Guy Adami went head to head over the issue.

By CNBC's Leanne Miller