both Green tea and Black tea are good for the health, they have an anti-oxidant effect (which contribute to reduce cardiovascular problems). Tea researches are still in the early stages, we hope we'll have some serious results soon.

yeh black tea is healther than green tea coz we use milk in it

Green tea is healthier because it contains more antioxidants than black tea. Adding milk to tea reduces the effect of the benficial antioxidants (polyphenols )