I have some information about what kind of wine may be most healthy. According to a recent study:
"Wines richest in [condensed] tannins had the greatest protective effect on the cells and were from regions -- Sardinia and southwest France -- that use Old World winemaking techniques.
Further research showed these areas are also associated with lower heart disease rates and higher longevity, he says.
The study found that wines made from the Tannat grape in southwest France were highest in these beneficial tannins. That grape is rarely grown elsewhere."
(WebMD: Old World Red Wines May be Healthier)