Going back to my (UK) source document again, balloons in the UK over that 10 year period suffered 32 reportable accidents, causing 1 fatality and 20 serious injuries. That's over a fleet of about 1900 aircraft. So, that's 3% of balloon accidents causing a fatality.
Non transport fixed wing GA suffered 1963 reportable accidents, during 19% of which included injuries (both major and minor), and 6% included fatalities.
So, if you have an accident in a balloon, the odds are over three times higher of somebody being injured than in a FW, but the odds of someone actually being killed about half.
G